That isn’t the reason, the problem persists after removing that add-on and restarting.
2026-08-03 13:22:13.351 [INFO ] [el.core.internal.ModelRepositoryImpl] - Loading DSL model 'thermostat.rules'
2026-08-03 13:22:13.397 [INFO ] [el.core.internal.ModelRepositoryImpl] - Loading DSL model 'upb.rules'
2026-08-03 13:22:14.059 [WARN ] [e.internal.VoiceManagerConfiguration] - No configuration description found for system:voice, unable to apply defaults!
2026-08-03 13:22:20.415 [ERROR] [.handler.AbstractScriptModuleHandler] - Script execution of rule with UID 'startup-1' failed: 'sendMail' is not a member of 'org.openhab.core.thing.binding.ThingActions'; line 6, column 3, length 74 in startup
2026-08-03 13:22:20.416 [INFO ] [e.automation.internal.RuleEngineImpl] - Rule engine started.
2026-08-03 13:22:39.358 [WARN ] [rest.core.item.EnrichedItemDTOMapper] - Failed transforming the state 'NULL' on item 'SecondFloor_Tstat_State' with pattern 'MAP(ct100.map):%s': Transformation service of type 'MAP' is not available.
2026-08-03 13:22:39.362 [WARN ] [rest.core.item.EnrichedItemDTOMapper] - Failed transforming the state 'NULL' on item 'SecondFloor_Tstat_FanMode' with pattern 'MAP(ct100-fanmode.map):%s': Transformation service of type 'MAP' is not available.
2026-08-03 13:22:39.365 [WARN ] [rest.core.item.EnrichedItemDTOMapper] - Failed transforming the state 'NULL' on item 'ForecastTodayIcon' with pattern 'JS(wmo-icon.js):%s': Transformation service of type 'JS' is not available.
similar here (1 x restart, clean cache (because it was seeing duplicate uninstalled binding for Homie) and a second restart after the clean cache and then had a strange restart mid day that i could not debug, but otherwise seems v-good