[Nobody]

I let it clean and refill it as I did my engine work year and half before. It was done by local Subaru dealer who owes Toyota dealership and service with AC shop as well. Maybe try to check it with someone else. Definitely it is working in normal temps, it means compressor is working and system is cooling. It just occure as it seems it is overheated so no dirt or such a problem. If there is dirt or watter it would behave the same all the time, not only "overheated", does not it?
What I suppose there is problem with presure, ec not enough refrigerant, so if there is normal temperature is easy for system to cool but if there is extensive temperature and systems wants to use maximum power it can not deliver it as presure is too low. Is my logic OK?
Thanx Petr