My partner and I were trying to do a raid in our realm, both playing on Switch. The first time, we showed up to a village (where I've completed raids before) with Bad Omen, the raid started to trigger, and then the loading bar disappeared before the first wave started. I lost my Bad Omen and the raid didn't happen. I left, got Bad Omen again, and came back. This time the raid started and we completed three waves in about five minutes before it randomly ended again. No defeat, the progress bar just disappeared and the raid ended. Didn't try a third time.