Okay... SOOOOO.... I have two issues with this.
The sound muting itself for a moment, then unmuting itself, only happens with Classic PSO2 (Base PSO2), and the screen just randomly freezing, but the audio stays intact for a bit until it actually crashes.
It ain't my specs, my PC can run this. But I better put more details.
So the sound one. While I was on a few Quests, in Classic PSO2, the sound just randomly mutes itself for a moment. This doesn't bug me much, but it does get annoying. The reason it doesn't bug me much is because I can still play the game.
The next, is probably already stated by others in the forum. Some random time, whether I'm on NGS or Classic PSO2, the game will randomly freeze the screen, but the audio still plays for a moment, meaning I can still go into menus by sound. But, however, I can't see anything of what's going on because the screen is frozen. A moment later, the game crashes. This issue seems like it's remedied a bit, as I haven't experienced it at all in NGS lately, and it's become a bit of a rare happening in Classic PSO2.