PMP450x Release 21.1 is now available

Just upgraded to V21, had a large storm, and 450SMs stopped reporting S/N readings when they re-aquired…Had to reboot them plus some of the AP’s also stopped logging the upstream S/N readings so reboot of the affected AP’s was also required. Never have seen this before with earlier versions of firmware. Is this something new in V21 or has it been seen by others?