IOS 4.2.1 intermittent data

Question

Wifi connection will disconnect intermittently on both my iPhone 3G and iPhone 4. This happens sometime to both at the same time, or one at a time.
I did a lot of test on my wireless network trying to find the cause of this. What i discovered shows that it is a problem with the iphones or the iOS, and definitely not my network.
When the iphone 4 would not load web pages, or App Store, I tried pinging the local I.P. address for it. It did not show any response to the ping. As if no device was there.
I also ran a network ping app called "Ping Lite" It allows me to ping the entire network. While simply trying to ping my router, i received no response.
I tested this literally for six hours. Most of that time it failed to ping. Sometimes, it would ping just fine, with 0% packet loss, and anywhere from 10 ms to 100 ms response times.
Sometimes it was both phones at the same time, other times it waas one at a time. I even went as far as having the app do a continuos ping, on both devices at the same time, while having three CMD windows open on the PC desktop pinging both devices AND my router.
The two iphones would intermittently lose connection to the router every few minutes for a few minutes at a time (sometimes 15 or so minutes). The two CMD windows pinging the two iphones would show that the devices were not responding in kind. But my wireless router never failed to respond to the PC, and had an average response of up to 2 ms (and PC is using wireless connection).
I haven't tested 3G for this problem yet. Although, I do see the antenna strength go from 4 bars to 0 bars, sitting on my desktop, not being touched at all. ON BOTH PHONES, and not at the same time. One phone will be full up, while the other has no signal at all.
I did notice immediate but temporary repair by simply turning wifi off/on again.

Answer 1

Oh, yes, btw, every tip to I have seen to get data to reconnect has worked. Power off, shut down, airplane mode and back, wifi off and back, reset network settings, it also fixes itself if I leave it long enough. Problem is it always comes back.
Forgot to mention this, streaming video (I.e. Netflix, Hulu) work absolutely fine. Once they start. If the data connection is good, and I get a video to start, it will run the entire video. There will be an occasional hiccup in network speed. The video quality will drop for a few seconds, and come right back to high quality (HD?). This might happen once or twice, but not often.
This data glitch seems to be on creating a connection.