PPSSPP Core - Random Freezes/Crashes; Error 80020068

Libretro Cores
#1

As the title says, PPSSPP experiences random freezes resulting in Retroarch crashing. The log reads as follows:

[libretro ERROR] [SCEINTC] sceKernelReleaseSubIntrHandler(30, 0): error 80020068

[libretro ERROR] [SCEINTC] sceKernelReleaseSubIntrHandler(30, 0): error 80020068

[libretro ERROR] [SCEKERNEL] __KernelGetWaitID ERROR: thread 450

Does anyone have any idea what might cause it? Many thanks in advance.