Home Hub 5 Firewall bug causing dropped DSL connec...

We've had infinity 2 since the start of December (2013) and have had nothing but problems with it.  It frequently (5x a day atm) drops the connection, sometimes it fails to re-obtain the connection so does a full restart.
We had an engineer round who couldn't find anything wrong with our line, swapped us to another cable pair, but after a week of "stabilisation", the problems were still there.  We had a "new" home hub, which had been left using a test bench WiFi Id, so I suspect it was another faulty return they've given us.  It has been better - possibly 1/2 the number of disconnects, but still having problems.  We had another engineer round, who replaced the backplate on the BT socket with a new one, with better rated capacitor for filtering.  A few days later, not much better.
What I have noticed from the logs, is that the loss of connection frequently happens a few minutes (normally 2, sometimes 10) after the hub has blocked bogus (normally Chinese) remote admin attempts.  Is there another attempt they're making that kills it, or is there a potential bug in the firewall that trips the reset?
08:34:03, 01 Feb.
IN: BLOCK [16] Remote administration (TCP 61.160.195.250:6000->86.134.x.x:22 on ppp3)
08:05:09, 01 Feb.
IN: BLOCK [16] Remote administration (TCP 211.75.112.37:61650->86.134.x.x:80 on ppp3)
It quite often drops the connection just after I have connected using my Android phone (which has no problems with any other device).
The log (before a reset) also includes bogus entries such as:
09:08:18, 01 Feb.
BLOCKED 2 more packets (because of Advanced Filter Rule)
09:08:17, 01 Feb.
OUT: BLOCK [44] Advanced Filter Rule (fw/policy/0/chain/fw_ath12_out/rule/0: UDP 0.0.0.0:68->255.255.255.255:67 on ath12)
Again, the firewall kicking in, just before a reset?  Coincidence?
Line stats:
3. Firmware version:
Software version 4.7.5.1.83.8.173.1.6 (Type A) Last updated 15/01/14
4. Board version:
BT Hub 5A
5. VDSL uptime:
0 days, 00:28:57
6. Data rate:
6446 / 52409
7. Maximum data rate:
6616 / 52721
8. Noise margin:
6.2 / 6.1
9. Line attenuation:
0.0 / 23.2
10. Signal attenuation:
0.0 / 21.3
I'll have to give the line a few more days after last week's engineer visit before they'll listen to me again, but I'm considering cancelling my contract on the grounds they're unable to provide me with a stable broadband connection - despite the same line running standard ADSL perfectly well for 4 years
Oh, the HH5 also makes a quiet whining and ticking noise if you stick your ear up to it - is this normal?

You still have the same fault but not with the OR modem. Sounds like the HH5's are faulty
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    18:26:44, 19 Mar. (34169.640000) PPP LCP Send Configuration ACK
    18:26:44, 19 Mar. (34169.640000) PPP LCP Receive Configuration Request
    18:26:44, 19 Mar. (34169.640000) PPP LCP Send Configuration Request
    18:26:42, 19 Mar. (34167.610000) CWMP: Server URL: https://pbthdm.bt.mo; Connecting as user: ACS username
    18:26:42, 19 Mar. (34167.610000) CWMP: Session start now. Event code(s): '4 VALUE CHANGE'
    18:26:42, 19 Mar. (34167.370000) CWMP: Initializing transaction for event code 4 VALUE CHANGE
    18:26:33, 19 Mar. IN: ACCEPT [57] Connection closed (Port Forwarding: UDP 192.168.1.66:3074 <-​-​>109.150.222.230:3074 [82.9.36.163:3074] ppp3 NAPT)
    18:26:32, 19 Mar. (34156.770000) PPP LCP Send Termination Request [User request]
    18:26:20, 19 Mar. IN: BLOCK [12] Spoofing protection (IGMP 192.168.1.254-​>224.0.0.22 on ptm0.101)
    I do have a OR modem around, unused, that I managed to talk one of the engineers in to giving me, as plan was to use my AirPort Extreme, but I didn't want to start using that until the connection was fixed, as first thing bt support would say is that it's my router causing the fault.
    I could try the OR modem, just not sure if this is my problem or not. Anybody know anything from the logs I have posted? Or will any other logs help out?

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