Problem Asus RX460

The problem is that there is a certain point the map started to warm up, it is not new, but she's only 2 years. Has established a program Assovsky: ASUS GPU TweakII. It was thought to tighten up the cooler along with thermal paste changed. In short, he opened the side panel of the computer and all fps up again. But some friezes still present and sometimes movies like that logout.
And now in the same app (ASUS GPU TweakII), immediately after starting the computer (it's in the startup) I saw that in 3-4 minutes, with the GPU Clock and Memory Clock went up from $ 240 and 1200 to 1244 and 7000, respectively. The question of why she does it, if it is not running? Or is that supposed to be?
Now suddenly thought, what if someone mines on my map.....
Who that understands the prompt!
_________________________
After writing this post I decided to test the theory with mining, stupidly unplugged the Internet and voila - indices dropped and all became norms.
What would you recommend?