Suddenly lags and fps drops what to do?

It has been like this for a month, e.g. When i play minecraft i have normal fps at the beginning and it also runs very smoothly but after a while the fps go completely randomly down (60-80) and don't work anymore up again and the gameplay also feels very spongy and superfluous (same problem in valorant and csgo) I was always able to play the games very smoothly without lags and something like that has never happened to me, I don't know what to do…

Update graphics driver

Is up to date

Close all background programs and try again. Did you install something new / changed something?

So I think it started where I had my 1st problem (my 1 question here with the problem) there was something with my ram bar that was not displayed but somehow managed, then my monitor cable was defective, But 1 day later I got a new one and everything went again, so I think it started right there after my 1st problem, it could be that I postponed something (when I cleaned my pc) or something and therefore the problem here has with the fps drops? I also think I did a window update that day, but lately I haven't actually installed / changed anything

So about before the problem I just cleaned my pc, that's why the problem with the ram bar, so I suspect that it wasn't just the ram bar.

@ MuffingamerHD1?

Take a look at the utilization of the individual components while playing in the Task Manager and Performance. When it comes to the FPS drops, look what exactly is jumping up in the load.

My cpu temperature goes up to max. In minecraft I don't move at all, the cpu load goes down and has normal fps again, but when I move it shoots up again completely…