iPhone 5 screen issue?

Question, I've had my iPhone 5 since launch day. I have been having an issue where I will be on the phone I look at it and there are colored vertical lines on the screen, it goes very dim then reboots seeing the apple logo screen then back to the home screen. It's happened about 3 times on 6.0.1. Today I decided to update to 6.0.2 after i got the phone completely setup as a new phone and all my apps back on I was using it playing words with friends and it happened again. Please advise and has anyone else had this problem.

Thanks