mac mini – Video playback freezes – Mojave 10.14

I am using a Mac mini (late 2012) with Mojave 10.14, and I have problems with video playback.

After using the Mac to play videos, whether it is playing online files / YouTube or IINA / VLC, after 8-10 minutes of use, it freezes for a few seconds, then continues without problems for another 8-10 minutes, freezes again, and so on.

Needless to say, it was perfectly fine in High Sierra (same applications and content).

Please help!