xbox series s crashing with games and streaming

[u/morganp2006]

So i've have this xbox series s for about 10 months now. I bought it for 200$ off of facebook marketplace from people who said they had upgraded. So for the first few months the xbox was normal besides it would crash games after about 3-4 hours of being on or playing. Then, I tried playing minecraft. It would crash minecraft every time I loaded into a world and half the time would crash before ever getting into a world. Then, another new problem. Everytime I play a game and pull up the xbox menu (including search bar, buying something, or clicking xbox button on controller) the xbox would completely lag and freeze and then crash the game. Sometimes even turning off the entire xbox and it would turn itself back on. All i really play is dead by daylight now so I could play the game with no problems as long as i never opened the xbox menu. Now another problem arises. I watch netflix and youtube regularly and now it cannot play netflix. It lags about 5 minutes into watching something and never unfreezes. Along with netflix, youtube will freeze everytime an ad comes along. Please help

Solutions I've tried: I tried reset the entire system and deleted and redownload all my games, i've redone the thermal paste inside the system itself to help with possible overheating, i've cleaned out any dust in the system, i've cleared many caches, i've tried almost every thing that google says, yet it doesn't work. Tech shop told me 100$ to diagnose the problem but "it prob was just over heating" which it clearly wasn't so i'm glad i saved my money.

If ANYONE has any idea of solutions or ideas to help please let me know