I have had the Viper for 5 months and I continue to have these issues:
phone is hot to the touch, especially when charging (replaced battery still happens), has overheated and had to shut off and pull out battery
randomly restarts self (around 7:30 pm each night)
will turn itself off (fully charged) and won't turn back on until connected to charger
keyboard won't respond for several seconds, then won't respond to touch and types crazy things
keyboard jumps around and types things double for example tytypetype even though only typed the word once
I have had the phone checked multiple times, they found nothing wrong and up-to-date. It now has Ice Cream Sandwich operating system and things seem to be worse. I am really getting tired of the phone doing these problems and would love a solution. Getting a new phone is out of the question for two years. Thanks!
I just got this phone less than a month ago and am having similar issues, mostly with the lagging and locking up. Overheating hasn't been an issue but the lagging and locking up is making me so mad! I love the little things about this phone but the fact that it hangs when trying to open things is driving me nuts. I am working on talking to Sprint about the issue.