only 20 seconds playback

[atuctuc]

hallo,
i tried wl8960 driver on raspberry 3 and 4 rasbean buster.
the installation works good, it shows everthing fine,

i can play a soundfile:
aplay -D plughw:CARD=wm8960soundcard,DEV=0 test.wav

but, this runs only for ~20 seconds, after that no sound is produced, i have to reboot to get sound again.
but the alsamixer still works ok.
does anybody know, how to solve this?

thanks anan