ipad pro pencil problem in a specific area almost all apps

my ipad pro 12.9inch is been having this issue with a particular art of the screen where the pencil jumps and wiggles and doesn't work properly? i was wondering if this has happened to someone else before i go into apple on thursday what it could be and if i could get some insite, iPad has always been in a case never dropped no water damage nothing its still in warranty till may 2020