I posted a previous topic with a bunch of issues, but I think I narrowed it down to radio issues (both bt and ant+ I think as it affects the hrm).
First symptom that I noticed was that the connect app complained about having unexpectedly lost the connection to the watch and wanting to re-pair. In reality the watch could reconnect to sync activities, but if didn't maintain connection so notifications never popped up on the watch. All standard connection issue remedies were tried without improving the situation.
But then I started looking at my run data and could see it's become strange after the update. Here are two similar runs from the last month, before and after the update:
Before; cadence and balance super stable, and cadence right on the average line.
After: cadence LOOKS ok, but the average is 20 or so lower? And balance is reported as 44/56 with what looks like LOTS of drop-outs.