Tacx Genius loses resistance before finishing line

A couple of times in recent races my trainer loses all resistance a few meters before the finishing line (30-50m) while I am sprinting. The power drops off and I end up rolling in as others are passing me :-). I don’t know if the issue is Zwift losing control over the trainer or the trainer itself. I never have any connection problems but sometimes the resistance can also drop out earlier in a ride. Could it be a reaction to high wattage?