Hello, when i want to turn on main- front interior light with light in sun visors in skoda somethimes it works but somethimes not , but rear interior lights work. What is the problem?

Do a search for "water ingress" (it has been covered many times before) as this is the most likely cause.

Check the carpet is not wet in the drivers side rear (LHD car) if it is then the central convenience module/wiring connections is the cause. (this is under the carpet)

I drive RHD, please can you send me a pictures of this place where i must wacht , thank you very much for reply , and my carpet is not wet