I have a Verizon Motorola Droid Maxx running stock 4.4. I sync with my primary gmail account and also with my university email/google apps account. Over the past few weeks I've had the recurring problem that whenever the device loses its 4G connection for any extended length of time, it loses its authentication credentials for both of these google accounts and requires me to log in again. This seems to occur both when I connect to wifi or when I go somewhere where I lose cell signal. I get an "Account Action Required" notification, which takes me to the message "Couldn't sign in - You typed an incorrect password or your account has changed." When I reenter my password, I receive another error "Couldn't sign in - To access your account, you must sign in on the web." From there I can enter my information in the browser window it opens and usually successfully regain account access. I use 2-step verification on my primary gmail account. I tried setting up this phone with an app-specific password as I had done on a previous android device, but it did not seem to have any effect on the problem. Googling around I haven't found any other cases of people reporting this issue. Any insight would be appreciated. Thanks!