Hello, PS5 have an issue of dust clogging the PSU. Check your PSU, near the power cable if it's hotter than normal that might be it.
Just blow the dust away, and it should come back to normal.

I had this issue with Spider-Man Miles Morales and God of War Ragnarok and both times a clean up solved this issue.

After that I've also changed my PS5 to horizontal stand instead of vertical and never had this issue again...

Hope this helps.