Severe Audio Stuttering (Demon's Souls) [BLES00932]

Hi, i played this game with absolutely zero problems for something like 11 hours, then suddenly, without any change in the settings, the audio started stuttering, almost looping... Only workaround i found was to set SPU Threads to 1, but then i have poor performance (Severe frame instability and stuttering)... is there any other solution? Thanks!

Here are my settings and specs

CPU: Ryzen 5 3600XT
GPU: RX 580 Nitro+
RAM: 16GB DDR4 @3200Mhz

Game and emulator on main memory (1TB M.2)