I have 2 Smart Plugs, with each on its own schedule. One is scheduled to turn on at 7:00 PM and off at 11:00 PM. The other is also scheduled to turn on at 7:00 PM but off at 8:00 PM. Both are consitently 4 minutes slow. They turn on at 7:04 PM and off at 11:04 PM or 8:04 PM respectively. The 2 plugs are in a group, if that makes any difference. Both plugs are at 22.214.171.124, which appears to be the latest version of the FW. App is V2.20.50 (Android 11).
If anybody knows how to make a 4 minute time correction, I’d be very interested in knowing how to do it.