Just had a match where our bank was open, it got locked once by a couple of small blockers - I killed them, and it opened. Then got locked again by another blocker (missed what level), but never unlocked after killing the blocker. They did get to invade once or twice around the time this happened - not sure if an invasion plus a blocker spawn or kill at the exact same time threw something out of wack? Our team was stuck holding 15 motes each at one point, couldn't bank. Other team just ran away with it. Saw one post in r/raidsecrets (god knows why they put it there), where they describe the same thing having happened back in Nov 2020. And another in Dec 2020 r/DTG.