Hi @dandy64 ,
Couple of things to try:
Clear the tablet’s cache partition and check if this resolves the problem. [https://support.t-mobile.com/docs/DOC-28352|Here’s] how to do this.
Start the tablet in [https://support.t-mobile.com/docs/DOC-28317|safe mode] and check if the problem is still there or not.
If the problem is no longer there when in safe mode, then a ''downloaded app'' is the cause of the problem. The trick is to find out which one. You will have to uninstall the downloaded apps, one by one then restart the phone in normal mode between each uninstall to see if the problem is still there or not.
When it has gone then the last downloaded app to be uninstalled was the problem.
Since it only started recently, check which downloaded apps were installed or updated on or around the 12/15/2019 and start with them.