My P3 sort of cycles a horizontal line through it really fast making it oscillate the display, and I've noticed it's slightly brighter vertically on the far right side. Didn't know if this was normal or not. I got it from Trailer Guy earlier this year and finally got it in this past week so I'm not sure whats normal yet, also have yet to use it.

Mine does neither.

Bump, even worse in the cold, and very slow switching if activated to show the no trailer icon, anyone have this issue?

Mine was worse in the cold. They have a lifetime warranty. Return to the selling dealer or MFG and they will replace free of charge.

I did have to replace one of mine because of a fauly accelerometer, but neither of them have had any display problems. I think you live near me now, you're welcome to stop by and take a look.. (I'm between Danville and Bloomsburg)

x2 what montecarlo said though - mine was replaced with no hassles.