Two of my Shelly Motions are no longer processing actions

Two of my four Shelly Motions have no longer been processing actions at all for two days now. Sceneries are sometimes working but not reliable. They are also shown offline in the control app most of the time. I'm not sure if this was triggered by updating the FW to v2.2.0 because the most reliable working one is still on v2.9.0.

All my Motion 1 devices have been working fine for more than a year now. I tried a lot but found no way to fix it.

Saw that Shelly now suggests solving it temporarily with a Downgrade to FW 2.1.8. The Shelly Service Desk has suggested mt to go to 2.1.7 and that solved my problem above. I have the same problem with two TVRs and that also solves this.