Heating off but pump+boiler still running

[blahblah1]

I've had wiser installed for a couple of years with no issues.

The past few days the hub has started leaving the pump+boiler on, even though both hot water & central heating valves are turned off. Even if I set it to away mode it still runs. Sometimes forcing a heating boost and then cancelling it causes it to turn off properly. Last night I had to just unplug it at the mains to get it to stop even after the schedule set everything down to low.

This seems to me like a bad automatic firmware update or that sort of problem. Have there been any firmware updates or similar issues recently and if so how do I diagnose or revert it?