PS3 slim question

Hello, my playstation 3 slim started to turn off as soon as I started playing, this has already happened several times. I cleaned it, changed the thermal paste and nothing. I am from a country where 220V is used, it occurred to me to use a voltage transformer from 220v to 110v (since the PSU works with both). Currently my PS3 runs at 110v, so far without problems. Do you think it is the PSU that is failing? or can you think of something else?

I seen youtube videos when the PS3 starts overheating the repairs have to do with reballing the processor and the GPU. Do you have a repair shop that will take it in to fix it?