lu9jmg:
Busy pin is not always detected when using synchronous playback (playVoice), so add a delay of 50 ms before the detection of busyPin.
Add delay(50) in the line 42 of Wtv020sd16p.cppGood Luck!
I think that could solve the problem, but according to the manual, only 20 ms will do the job. I will test it and add that to the library, so nobody have to add code.