Hi,
I also did the upgrade to 2.2, worked fine until morning, when I noticed all upgraded TRV were turned off, after turning them on, they started calibrating.
I tried to downgrade to 1.8 as described in the pinned thread, but that requires the TRV to be connected to the internet. I tried factory restarts few times, different wifis, nothing seems to help. Same as reenpf, that upgrade effectively bricked my TRVs.