Hello  @CFT 

May I know did you use any other third-party software/ app/ phone settings to control smart device other than TP-link Kasa APP? If yet, for a test, you could temporarily unlink KL125 from those third-party apps.   

- remove Schedule/ Smart Actions/ Timer/Away Mode settings on kasa device： 

How to setup schedule, away mode and timer of TP-Link Smart Plug/Switch in Kasa APP?

- check if bulb will ramdomly turn on in factory default state (note: do not set up with home Wi-Fi network first after factory reset when test this)

How to reset TP-Link Kasa smart bulb? keep it in the factory default state and observe that happens or not.

If still the same,  please describe phenomenon/frequency in details: 

e.g : KL125 V2 turn On randomly 2-3 times/ day and stay ON last time happened at 9AM UTC+2. 

Does bulb turn on when work in factory default state?