My screen started doing some funky stuff this morning. If I hit the power button to turn the screen on, nothing happened. To make a long story short...I just left the sprint store and had to spend 10 minutes with some nipple head who thought I rooted my phone and that was why it was geeking. I was running OTA 2.2.
I wouldn't worry about it. 90% of the people on this site know more about their phone than Sprint does. You should be able to talk your way out of anything they have to say.....and that's even if they say anything at all.