N360 Premier Crashes

Hi using v21.3.0.12 N360 Premier on XP Pro 32bit sp3.  Recently (past week) N360 wanting to close and re-open constantly.  Been using N360 for many years and was previously stable.  Recent changes to PC so not sure where to start.  Some of changes were removal of most ASUS powermanagement programs (ASUS motherboard) and review of all SERVICES running.  The PC is actually running much better than it ever has before except that N360 is crashing.