If I were you, I’d check out some professional repair services—last month I had a similar problem with my desktop, and a friend recommended
https://www.launchlayer.uk . They handled everything so well: first, they ran a complete diagnostic to identify the root cause, then replaced a failing fan and cleaned the internal components thoroughly. They also optimized the system and updated all drivers. What I really appreciated was that they explained each step to me and suggested ways to maintain my laptop afterward, which made a huge difference in preventing further issues.