Light randomly turns on by itself without being asked.

[rnodern]

I would like some help to identify what is going on.
I have these string lights "GP-SW060DC1400". They're basically wifi enabled Christmas lights. Randomly they just turn on without being asked.
Some background:

• I have 2 houses setup on one Tuya account, & one Google Home Account; (Home A and Home B)
• These lights were originally in Home A but have now moved to Home B.
• I have ensured that the device has been removed from Home A in Tuya, Google Home and Home Assistant.
• When in Home A, these lights used to be triggered at a specific time by an automation in Home Assistant. This automation is no longer enabled in Home A Home Assistant. The fact they turn on at random times kind-of rules out a scheduled automation anyway.
• I've checked the Tuya app to make sure there is no "Schedule" - again, the randomness of time that they get turned on can't be a schedule.
• The Home Assistant logbook for the device doesn't tell me much. It doesn't indicate a caller. However, i can see when i manually turn them off in the HA UI after they randomly turn on, i can see the turn off was triggered by service light.turn_off
• It doesn't happen every day. I'd say 3 times a week. At different times of day/night. Sometimes i walk past the room they're in, and just get surprised to see that they're on.
• No other lights, sensors or smart devices in Home A or Home B are affected by this issue.

Basically, i just want to get to the bottom of what's going on here and identify what is sending a turn_on to these lights.
Any ideas?