Moved to appropriate area...
Lay your phone screen down on a flat surface. Is it lying flat or does it wobble?
If it wobbles use GENTLE pressure to SLOWLY bend it back towards true.
Mine had this. I spent several sessions PATIENTLY straightening the device. Stop carrying it in any trouser pockets except the very roomiest ones. This is the main culprit. Having the phone in your pants pocket and sitting. You are forcing the phone to curve in order to match the contours of your thigh.