Happened to me 2 weeks ago, i jad to get the wjole screen fixed. Theres 2 screens one connects to spen and other your finger. (Hope i explained it right)
Update your phone’s software to the latest version.
Try turning off Touch sensitivity. To do so, go to Settings > Display now and simply turn off touch sensitivity from there.
boot your device in safe mode and check if any third-party apps are not causing the issue, if it does, then simply uninstall the recent third-party apps.
At last, if any of the solutions didn’t help you, then try to factory reset your phone, but back up your data before performing a factory reset.
