I have 3 Smart Actions, providing auto-off functions for two HS200 (hardware/firmware as above) switches controlling bathroom fans, and one for a HS105 plug controlling a hot water pump.  These have been working fine for the last few weeks (I am a new user) but in the last day or so they have all stopped working.  Doesn't seem to matter if they are turned on manually, using the app, or via Alexa ... they just do not turn off.  I am in the US and am using v2.26.0 | build 820 of the TP-LINK app.