After LG G5 battery swap and reboot, device time is wrong

Assumed: LG G5 phone, Android 8.0/Oreo (latest supported release), 2 batteries 1 Shut down phone 2 Swap battery 3 Reboot 4 Observe: time is wrong 5 Log in 6 Status bar upper right > Settings 7 Scroll to bottom 8 Tap System (2nd-to-last item) 9 Select Date & Time (3rd item) 10 If "Set automatically" on, uncheck 11 Check "Set automatically" - time now correct

Mr. Obvious says: wouldn’t it be professional, helpful - and good PR - if someone from (long-disbanded) LG G5 design team and/or tech support weighed in with an official solution, or even an insider’s unofficial kluge? Try to find someone on LinkedIn, twitter, Facebook? Perhaps an experienced 3rd-party tech? (Backup/wipe/restore seems a pretty risky experiment, never mind screwing around with internals.)