First of all thanks for the replies!
ColinBarber, i tought about going to local reapir shop, and i will do so next week. I will also try the instructions that you gave me above, maybe this will get me closer to the root of the issue. Thanks so much!
NemesisUK, i am actually in Romania, Bucharest. I have bought the car back in 2020, and i noticed the problem soon after that, but everytime the dealer told me that it's either a problem with the battery or that i don't drive often enough. Almsot 4 batteries later, they found out that there is a 154mA parasitic current. The batteries came with 1 year warrnity, but according to them, if they drop under x volts (can't remember exactly the number) the warrnity is voided. I disconnect the battery everytime i know i won't use the car for several days, which often happens becaus i don't drive that much.
IS300FSPORT, what you have there looks pretty smart. I tried to look for the name of your device and it got me to a Remote Battery Disconnect Switch which would be more suitable for me, at least for now. I bought a 12V power bank, which saved me a lot of times. I have tried the things you said, beside disabling smart acces (i am not sure how do that), and the car is always parked far away from the keys.
I will continue my journey with the 12V battery and i will come back here as soon as i get any news.
Thanks for the help and suggestions!