I switched to this firmware (5.0.1) about 3 weeks ago, and started to notice Kasa problems (no other changes to network configuration during this time).  I have an HS200, LB100 and several HS103.  Devices were disappearing from the Kasa app, sometimes going to an ON state.  So I was going to roll back to firmware 5.0.0, but noticed 5.0.2 became available in the meantime.  I upgraded to 5.0.2 yesterday, and Kasa connectivity seems stable again.  <fingers crossed>