I am afraid it happened again, I just noticed this morning.
From what I can see the token became invalid around one day after I had generated the new one:
2018-12-19 22:54:38.109 [ERROR] [nal.handler.HomeConnectBridgeHandler] - SSE token became invalid --> close SSE
2018-12-19 22:54:38.292 [ERROR] [nal.handler.HomeConnectBridgeHandler] - Could not refresh token!
Can this be related to some change in 2.4.0?