Fenix A320 suddenly disengage autopilot (video)

Any ideas why AP switched off by itself?

For first, I would have say that was the weather injection and new data from the server as that bump looks identical for that issue. However on the pfd there’s no wind change at all (and I have to admit; lately there’s a much less occasion when this thing happens). So still either that, or if you use realturb or similar app which “simulates” clean air turbulence (which would explain that rumble noise), was strong enough to trigger fenix’s ap threshold.