Using 4.1 beta on custom hw, on a quad frame using CRSF 23, around halfway through roll autotune quad decided to RTL, at first I thought it was a fly-a-way but no looking at the logs it had a radio failsafe so mode was change to rtl, changed to stabilise flew back no issues and landed.
Did 3 more flights with no issues except it would not complete a yaw tune on a single battery, in the logs I noticed yaw imbalance of 14% separate issue to the failsafe.
Regular CRSF, yes i was using Yappu telem but had forgotten to turn on crossfire in the Radiomaster config widget. So at that moment no although the quad was setup for it.