WSPR-AXE-CW oddity

A local, David G0LRD reported that my time sync was well adrift despite me doing a reset against internet time very recently. A hard reset (all power removed for over a minute) seems to have fixed the issue, which is possibly a bug in the software.  David suggested it could have been a very short power outage?   In future I'll do a hard reset more frequently. This little beacon has served me well for over 6 months and is often on 24/7.