Sudden confounding kick core problem

at my wits end…have contacted support but no word yet. flawless kickr core since nov 2020. suddenly I have no resistance in free ride mode. my kickr climb activates up and down on inclines/declines, but no resistance change. Watts and cadence seem correct, but at a low level given low/no resistance. I spinout at 100 watts and 100 rpm. ERG MODE WORKS FINE. This problem is the same across both Zwift and Rouvy. It is also the same across iPad, two Macbooks and Samsung ultra 22. Firmware is up to date. I have done countless spindowns on the wahoo app and reset the kickr core (re unplugged for a period of time). I have never changed the Zwift trainer setting. (it’s at the default midway setting) In searching, this seems to be a rare problem. Any ideas?

FYI, if this happens to anyone and they find this post…it happened when two apps tried to connect to the trainer at the same time, causing a conflict. The Wahoo resolution was to shut every possible device down, unplug the trainer and restart wahoo app and then trainer. The wahoo app was on device where the problem started and that process failed. I then loaded wahoo app on iPad and restarted and everything (finally) worked.