I haven't gotten sped up audio after waking from sleep, but sometimes the audio will be "crackly" and the only thing that'll resolve it is closing the game and restarting it. I used to use Decky's SDH-PauseGames plugin which fixed the audio issue, but it turned out that just having Decky installed was causing a few games to freeze constantly (even without any plugins enabled) so I uninstalled it. That was a while ago though so I dunno if this is still a problem with the current Decky version