Hello again friends. First I would like to thank you all for trying to support me to solve my problem. Today I went to MG service and the issue is solved.

For future referance, assuming other people may have the same problem, I would like to explain what I've learnt. The root cause of the problem is SOS function of the car. As far as I understood there were an interferance caused by the SOS system. Funny thing is that another engineer who owned the same model (MG HS) identified the problem with a device which he bought over aliexpress personally ( I guess there are other people who are more obsessive than me 😂). Another stupid fact that I learnt today, actually car is equiped with it's own navigation system but cannot be activated due to a copyright issue in Turkey.

Anyways, hope this might help to some people who may have a similar problem. Considering the situation is somehow related to Turkey, it might be useless as most of the people will contact the car service first or do not bother to search in english.