It's been completely random. My latest Bionic (3rd) was absolutely perfect for a few days. I rooted it and that's it - never pulled a leaked OTA or anything. Then all of a sudden one day it just wouldn't hold a data connection for most of the day. Constantly in and out... Nobody around me with other 4G phones on Verizon were having any issues. It remained bad for most of the day... the next day it was slightly improved, but still in and out. Just doesn't make any sense. Absolutely nothing changed on my end between the "perfect" days and the bad days. And then to top it all off, I had a BSOD happen to me twice on the 2nd bad day (which was yesterday). Never had that happen before, and again, I had changed nothing on my phone. So, who the heck knows... I do love it, but I can't justify the cost of a device like this if it can't function the way it's supposed to in some reliable fashion. And I've tried everything from the standpoint of possible solutions...b/c I want to keep it.