If you have no longer issues since a down-clock of your GPU , then your system was former in trouble.
This can be e.g. because of heating issue or a faulty PSU.
It is a little bit “hmmm” that you open now extra a “issue” topic for that, instead to mention it in the thread where your issue was initial reported:
( merged into ).
It’s may be for interesst in that topic, that hardware can have issues
