SanDisk iXpand App keeps crashing when i open videos

Here same behaviour cannot playback video’s anymore (photo’s are fine).Used to work as a charm.

All videos I playback crash the app, no matter what extension I try: Avi, Mov, MP4. Also small video’s

iPhone 6S, iOS: 10.3.3, App version 5.0.5, internal mem. 1.3 GB available, preview thumnails look fine.

Deleted app and reinstalled it, restart phone, but no success…:cry:

Anybody has suggestions? thnx!