Upgrade to 3.9.1 gave a lot of problems I had to downgrade to 3.8.6 to get it working.All my AEON multisensors had same problem.
Also my HEATIT floor thermosates stoped working.
Your symptoms match the behavior from v3.9.0. v3.9.1 is supposed to fix those problems. Double check you were actually using 3.9.1.
Yes I was using 3.9.1. Actualy instaled 3.9.0 first then upgraded to 3.9.1.
But i will try again to be sure (after guests have left the house 
)
It’s possible that going from 3.8.6 → 3.9.0 → 3.9.1 would require a re-interview of the affected devices for it to be fixed, as it looks like the regression affected the driver cache.
Going from 3.8.6 → 3.9.1 should avoid the regression and hopefully everything will work as-is.
Thank you for your prompt help. Just reinstaled som 15min ago 3.8.6 - 3.9.1. It seems that its working ass you said…
Rgrds
Ole