IMO it is an app that is doing this when it happens, I has not happened for a week, now and I disable an app and wait and see, it will be trial and error but I will find the culprit, as of now,I tried turning BT off, and that was not it, now I have turned Polling off on my Youmail app and has not done it since, so we will see, LOL
One possibility is that your phone might be running out of memory. When that happens, garbage collection can take a very long time and the phone becomes unresponsive.
I've had that happen only once (after installing Fennec) and while the phone was unresponsive, it only lasted for about a minute, not the 20-30 minutes people are reporting.
You could have some bad memory, which might cause the same effect. I would doubt, however, that you've had 3 phones with bad memory.
Just thought I'd mention it just in case...
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