Sound bugged out A3 at Checkpoint

Location: Act 3, Aggorat, SSF, Checkpoint near the Sacrificial Altair.

Problem: I reach the checkpoint near the altair, suddenly the soundeffects are gone. I can still hear ingame music. All Sound Effects and Ambient Sound are gone. Can't give any info on Dialogue Sound since I already killed the "talkative guy" at the square.

Hope this helps.