#2 The Backstage WrestleMania incident
It is being reported that neither Bayley or Sasha Banks knew of the decision to take the titles off of them until very late in the day of WrestleMania 35. Slice Wrestling alleges that Banks was furious and started yelling and arguing with a production official.
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Ryan Satin of Pro Wrestling Sheet has a more subdued report of a potential backstage incident. He has reported that multiple sources have told him that both Bayley and Sasha Banks were lying on the floor backstage at WrestleMania 35 and later in the day at their hotel loudly complaining about the booking decision.
Either way the consensus does seem to be that Sasha Banks was definitely involved in some kind of backstage altercation regarding losing the titles.