Nokia E52 choppy VoIP due to WLAN interruptions an...

I love my Nokia E52, but one of the main reasons I bought it (the combination of WiFi Wireless Lan support and fully integrated Voice over IP client) is not usable due to very laggy, unsteady WLAN connection (while having perfect signal strength - E52 shows 100% (same room)).
Because of this I get choppy VoIP (cracks and interruptions up to several words in my VoIP conversations).
My E52:
Software version: 031.012
Modell: E52-1
Type: RM-469
This is not a problem of the VoIP Client, audio-codec, or SIP provider/internet connection.
It is the Wireless Lan connection between my E52 and my Router. I tried 3 different access points, with and without wireless encryption, 802.11b (1M...11M data-rate) and 802.11g - problem always the same.
I can track it down by pinging my E52 (idle without any programs running) from my Linux box:
192.168.0.100 is the IP of my E52 assigned by DHCP.
1.) 64byte pings, once per second:
PING 192.168.0.100 (192.168.0.100) 56(84) bytes of data.
64 bytes from 192.168.0.100: icmp_seq=1 ttl=69 time=6.36 ms
64 bytes from 192.168.0.100: icmp_seq=2 ttl=69 time=57.9 ms
64 bytes from 192.168.0.100: icmp_seq=3 ttl=69 time=80.9 ms
64 bytes from 192.168.0.100: icmp_seq=4 ttl=69 time=203 ms
64 bytes from 192.168.0.100: icmp_seq=5 ttl=69 time=128 ms
64 bytes from 192.168.0.100: icmp_seq=6 ttl=69 time=50.0 ms
64 bytes from 192.168.0.100: icmp_seq=8 ttl=69 time=324 ms
64 bytes from 192.168.0.100: icmp_seq=9 ttl=69 time=79.7 ms
64 bytes from 192.168.0.100: icmp_seq=10 ttl=69 time=37.5 ms
64 bytes from 192.168.0.100: icmp_seq=11 ttl=69 time=60.0 ms
64byte pings using a good wireless 802.11g connection should be around 1ms and constant!!
It's not because of bandwith limit of E52 wlan/cpu, because the higher ping times stay the same, even if I increase ping-packet-size 150x:
2.)10000byte pings (150x times bigger packages!), once per second [still ping times look quite similar]:
PING 192.168.0.100 (192.168.0.100) 10000(10028) bytes of data.
10008 bytes from 192.168.0.100: icmp_seq=1 ttl=69 time=175 ms
10008 bytes from 192.168.0.100: icmp_seq=2 ttl=69 time=89.8 ms
10008 bytes from 192.168.0.100: icmp_seq=3 ttl=69 time=115 ms
10008 bytes from 192.168.0.100: icmp_seq=4 ttl=69 time=234 ms
10008 bytes from 192.168.0.100: icmp_seq=5 ttl=69 time=153 ms
10008 bytes from 192.168.0.100: icmp_seq=6 ttl=69 time=83.7 ms
3.) Small 64byte pings, but now ten pings per second:
Now it gets even more strange:
# ping 192.168.0.100 -i 0.1
PING 192.168.0.100 (192.168.0.100) 56(84) bytes of data.
64 bytes from 192.168.0.100: icmp_seq=1 ttl=69 time=200 ms
64 bytes from 192.168.0.100: icmp_seq=2 ttl=69 time=95.0 ms
64 bytes from 192.168.0.100: icmp_seq=3 ttl=69 time=2.25 ms
64 bytes from 192.168.0.100: icmp_seq=4 ttl=69 time=5.93 ms
64 bytes from 192.168.0.100: icmp_seq=5 ttl=69 time=4.34 ms
64 bytes from 192.168.0.100: icmp_seq=6 ttl=69 time=8.45 ms
64 bytes from 192.168.0.100: icmp_seq=7 ttl=69 time=5.91 ms
64 bytes from 192.168.0.100: icmp_seq=8 ttl=69 time=2.69 ms
64 bytes from 192.168.0.100: icmp_seq=9 ttl=69 time=2.31 ms
64 bytes from 192.168.0.100: icmp_seq=10 ttl=69 time=5.90 ms
64 bytes from 192.168.0.100: icmp_seq=72 ttl=69 time=8.42 ms
64 bytes from 192.168.0.100: icmp_seq=73 ttl=69 time=7.25 ms
64 bytes from 192.168.0.100: icmp_seq=74 ttl=69 time=7.28 ms
64 bytes from 192.168.0.100: icmp_seq=75 ttl=69 time=7.25 ms
64 bytes from 192.168.0.100: icmp_seq=76 ttl=69 time=7.24 ms
64 bytes from 192.168.0.100: icmp_seq=77 ttl=69 time=7.92 ms
64 bytes from 192.168.0.100: icmp_seq=78 ttl=69 time=7.24 ms
64 bytes from 192.168.0.100: icmp_seq=79 ttl=69 time=8.69 ms
64 bytes from 192.168.0.100: icmp_seq=80 ttl=69 time=10.9 ms
64 bytes from 192.168.0.100: icmp_seq=81 ttl=69 time=10.6 ms
64 bytes from 192.168.0.100: icmp_seq=150 ttl=69 time=213 ms
64 bytes from 192.168.0.100: icmp_seq=151 ttl=69 time=105 ms
64 bytes from 192.168.0.100: icmp_seq=152 ttl=69 time=3.09 ms
64 bytes from 192.168.0.100: icmp_seq=153 ttl=69 time=2.23 ms
64 bytes from 192.168.0.100: icmp_seq=154 ttl=69 time=2.14 ms
64 bytes from 192.168.0.100: icmp_seq=155 ttl=69 time=3.78 ms
64 bytes from 192.168.0.100: icmp_seq=156 ttl=69 time=3.02 ms
64 bytes from 192.168.0.100: icmp_seq=157 ttl=69 time=5.48 ms
64 bytes from 192.168.0.100: icmp_seq=158 ttl=69 time=2.15 ms
64 bytes from 192.168.0.100: icmp_seq=159 ttl=69 time=2.13 ms
^C
--- 192.168.0.100 ping statistics ---
159 packets transmitted, 30 received, 81% packet loss, time 16866ms
rtt min/avg/max/mdev = 2.130/25.327/213.218/54.102 ms, pipe 2
Note: My Linux Ping Command doesn't say something like "Request timed out." for lost packets (like Windows Ping does). So if there is a jump from icmp_seq=81 to icmp_seq=150 it is because everything in between got lost.
You see, in 3.) it has the slow pings once in a while and in between almost normally fast pings, but suddenly a long lag of 6-7sec (this is deadly for voip) and then the circle repeats.
Is my E52 wlan chip defect, or is this some kind of Power-Management system? How can I turn it off?
I don't need a fast wlan connection on my E52. 1MBit/s is more than enough. But it has to be steady, without lags.
Ideas, anybody? Please!

Well, it has nothing to do with the VoIP service itself for sure. As razvan_t has already noted earlier this problem affect all network services like internet radio.
It behaves exactly as E52affair described in the very first post. If I ping the phone through my home LAN using ping with normal settings, i.e. 1 packet per second nothing much wrong happens. It finishes with some 1% packet loss. But when I increase the ping frequency up to 10 packets/s the same test ends with terrible >80% packet loss as you can see below. And the following pattern can be observed during this test: 10 packets goes through well then some 60-70 packets is lost and it repeats again and again. Lags in VoIP audio stream correspond to the lags in ping. The wifi conditions are excellent, phone is located some 2 meters far from the router´s wifi antenna.
I tried watch some video on Youtube. The video stream was prefetched in jumps appearing with the same frequency as lags in fast ping were observed during the test.
Before I found this thread I obviously thought it was a VoIP problem. Therefore I tried various VoIP settings, different codecs, nothing has helped. Now it is clear why.
I even did a phone hard reset. It did not help neither.
Because I observe almost the same lags in VoIP even when the phone is connected using the packet data through the GSM network, I suppose the problem is not limited to wifi connection only. But I cannot confirm this theory because I´m not able to ping the phone throughout the GSM data network.
jirka@pc-jirka:~$ sudo ping 192.168.100.14 -i 0.1
PING 192.168.100.14 (192.168.100.14) 56(84) bytes of data.
64 bytes from 192.168.100.14: icmp_req=1 ttl=69 time=64.6 ms
64 bytes from 192.168.100.14: icmp_req=2 ttl=69 time=7.58 ms
64 bytes from 192.168.100.14: icmp_req=3 ttl=69 time=7.61 ms
64 bytes from 192.168.100.14: icmp_req=4 ttl=69 time=7.62 ms
64 bytes from 192.168.100.14: icmp_req=5 ttl=69 time=4.36 ms
64 bytes from 192.168.100.14: icmp_req=6 ttl=69 time=7.64 ms
64 bytes from 192.168.100.14: icmp_req=7 ttl=69 time=7.93 ms
64 bytes from 192.168.100.14: icmp_req=8 ttl=69 time=7.57 ms
64 bytes from 192.168.100.14: icmp_req=9 ttl=69 time=7.58 ms
64 bytes from 192.168.100.14: icmp_req=10 ttl=69 time=7.60 ms
64 bytes from 192.168.100.14: icmp_req=69 ttl=69 time=568 ms
64 bytes from 192.168.100.14: icmp_req=70 ttl=69 time=461 ms
64 bytes from 192.168.100.14: icmp_req=71 ttl=69 time=354 ms
64 bytes from 192.168.100.14: icmp_req=72 ttl=69 time=248 ms
64 bytes from 192.168.100.14: icmp_req=73 ttl=69 time=140 ms
64 bytes from 192.168.100.14: icmp_req=74 ttl=69 time=33.0 ms
64 bytes from 192.168.100.14: icmp_req=75 ttl=69 time=7.58 ms
64 bytes from 192.168.100.14: icmp_req=76 ttl=69 time=4.48 ms
64 bytes from 192.168.100.14: icmp_req=77 ttl=69 time=7.68 ms
64 bytes from 192.168.100.14: icmp_req=78 ttl=69 time=7.65 ms
64 bytes from 192.168.100.14: icmp_req=147 ttl=69 time=57.9 ms
64 bytes from 192.168.100.14: icmp_req=148 ttl=69 time=5.26 ms
64 bytes from 192.168.100.14: icmp_req=149 ttl=69 time=7.68 ms
64 bytes from 192.168.100.14: icmp_req=150 ttl=69 time=7.60 ms
64 bytes from 192.168.100.14: icmp_req=151 ttl=69 time=7.67 ms
64 bytes from 192.168.100.14: icmp_req=152 ttl=69 time=8.07 ms
64 bytes from 192.168.100.14: icmp_req=153 ttl=69 time=7.67 ms
64 bytes from 192.168.100.14: icmp_req=154 ttl=69 time=4.24 ms
64 bytes from 192.168.100.14: icmp_req=155 ttl=69 time=7.62 ms
64 bytes from 192.168.100.14: icmp_req=156 ttl=69 time=7.53 ms
64 bytes from 192.168.100.14: icmp_req=225 ttl=69 time=99.5 ms
64 bytes from 192.168.100.14: icmp_req=226 ttl=69 time=3.79 ms
64 bytes from 192.168.100.14: icmp_req=227 ttl=69 time=20.3 ms
64 bytes from 192.168.100.14: icmp_req=228 ttl=69 time=3.91 ms
64 bytes from 192.168.100.14: icmp_req=229 ttl=69 time=4.57 ms
64 bytes from 192.168.100.14: icmp_req=230 ttl=69 time=4.70 ms
64 bytes from 192.168.100.14: icmp_req=231 ttl=69 time=7.95 ms
64 bytes from 192.168.100.14: icmp_req=232 ttl=69 time=5.35 ms
64 bytes from 192.168.100.14: icmp_req=233 ttl=69 time=5.65 ms
64 bytes from 192.168.100.14: icmp_req=234 ttl=69 time=5.63 ms
^C
--- 192.168.100.14 ping statistics ---
294 packets transmitted, 40 received, 86% packet loss, time 31394ms
rtt min/avg/max/mdev = 3.795/56.194/568.719/126.270 ms, pipe 6

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Attachments:
Copy of Error.JPG ‏40 KB

You can do a hard reset of the device, but note that *ALL DATA* on the device will be ERASED. To do a hard reset ( where the phone is almost rewritten ), press *#7370#. If it still doesn't seem to solve, turn off the phone and press *, 3, dial ( green ) and power key altogether till the phone turns on. Always backup before you perform these functions.
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Dreaming of a 5320XpressMusic - 128MB RAM makes up for the 2MP cam !

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