V2 with Firmware 1.0.5 is the totally reliable in my experience (I have over 100 of these). If a factory reset gets you back to 1.0.5 I would recommend that. With V2 and 1.1.5 there will mostly be...

@NFerocious with the Tapo P100, FIrmware 1.0.5 with v2.0 hardware supported this intuitevely. I know Firmware 1.2+ doesn't (including 1.4.18) with hardware v1.20. I know your question is about HS100.

@yj_choi I can confirm that PyP100 works with Firmware 1.0.5 on Hardware Version 2.0 (older plugs). The "login" function fails however with Firmware 1.2+ (including 1.4.18) and on Hardware Version...