I had that happen twice as well. I just refollowed everyone. Now I'm more careful about adding relays and switching clients. I've heard it has something to do with that.
Okay thanks for the confirmation. I will try not changing the realys anymore for some time.
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My issue might have come from trying to use my Umbrel, something definitely wasn't working there, and taking the Umbrel out of my list fixed it. But I don't know your situation.