Originally Posted by teh_admiral
I'm having the same problem, and I do not have Lastpass. So please don't be useless and say it is that app. I do not have other apps installed to manage passwords, but whatever Android software is native to ATT does a good job at remembering passwords...
Somewhere else on the interweb someone said Line could be a culprit. Anyone???
Have you tried factory reset and/or Safe Mode? Those would eliminate the possibility that a 3rd party app is the culprit.
If those still don't solve the issue, I would recommend running the RUU. RUU will return all software to the stock image. So if the problem persists after RUU, I would tend to believe its a hardware issue.
I'm assuming you are running a stock device, but you haven't given that info. The problem with jumping onto an existing thread and saying "I have the same issue" is that the OP may/or may not have the exact same conditions as you (which is almost always not the case). And if you don't tell us the specifics, it makes it hard for us to help. For instance, the OP stated he tried factory reset, plus root and a custom ROMs (with no success) and we don't know if you did the same or not.
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Phone: AT&T HTC One (M8)
Tablet: Samsung Galaxy Tab Pro 8.4 (WiFi only)