Sound stops while using an effect

I’m using DJay Pro on an iPad Pro (1st gen, 9.7"). I’m not yet using an external soundcard and/or midi controller. I plan to change my equipment from laptop to tablet. Hence I’m trying to find out, whether or not DJay Pro will fit my needs :wink:

Yesterday I encountered a problem:
While using the Beat Wobble effect via pad, the sound suddenly stops. The GUI was still active. I saw the meters working (as if sound was actually being played), and I could start and stop the track. I could even load another track. But the sound kept missing.

Only restarting the software solved the problem. I could reproduce the effect 3 times in a row. After a few seconds with the Beat Wobble effect, the sound just stops.

Other effects appeared to work.

Any ideas?