Well this has been the most stressful week of my life in a very long many years (and for my girlfriend too, who is also trading options).
Today was the worst because we had to deal with being assigned on some BPS on Fidelity that put us both into a margin call. We were all set to re-enter the position, my girlfriend sold the assigned shares then went to sell the puts, but the system wouldn't let her. She got some error like "can't do this trade online". By the time we got Fidelity on the phone and they checked the issue and entered the trade, the stock had shot up from 122 to 127 and it looked like the big rally coming, so we sold the puts quickly, ending up with a $15K loss.
After getting out of any margin call issues, she tried to roll some BPS to better positions, but she would get similar errors. Then spent 2 hours(!!) on the phone with Fidelity to try to figure out the problem, nobody had a clue what the errors meant or why she couldn't do anything. Finally had to have them push a roll through over the phone.
Luckily for me, she had the big problem just before I tried to fix a similar assignment, so I called them on the phone ready to sell puts in case I had the same issue. I sold my shares, then still couldn't sell the puts, so they did it very quickly afterwards, then I had no more problems after that with further trades.
Expecting a few more assignment come Tuesday, but we got a few low time value spreads moved to better positions, so hopefully this will stop soon. On Etrade where I had similar issues, never ran into any problems or had to call anyone to deal with this stuff.