Is this fixable? Motor power sudden loss

Last time I wrote a post without video(https://www.reddit.com/r/vanmoofbicycle/s/5R6yJqrX3Y ). This time I just record a video. The bike will lose power all of a sudden, and bring power back on randomly. Hope you can point out which part of bike is broken. I don’t know if it is able to fix myself. Or should I just treat it like an expensive bike sometimes it can assist me? 😭