flicker each second on esp32

[totial]

I get a flicker almost exactly each second mostly noticeable when on low power ( 0 ~ 30 %). The flicker consists of the lamp getting bright for some milliseconds I guess. Dont have a oscilloscope here. Things I already tried without success to fix the issue.

• Serialmonitordim example from the library. Same problem than with my code using the library.
• Limit the working angle to make sure the gate isnt on entering next semi-cycle.
• Change timer number (from 0 to 2) on esp32.
• After turning the gate on a delay of ~60us and turning the gate off again. (shorter delay dont turns the triac on)
• Change timer interrupt to 100 times in one semi-cycle (one interrupt each 100us)
• Only turn on gate when it was not jet time to turn it off (just in case)
• Second timer to run after turning gate on to turn it off again. This second timer configuration produced a reset loop so not even working.
• Different pins for zerocrossing and thiristor.

Hope didnt forget anything. Any help and/or suggestion will be appreciated!

[totial]

The issue is somewhere in my own code!