Withdrawals seem to be working fine now. I just tried it again and good news that the request was completed within minutes. Confirmations might take a few hours though my transaction got a low fee about 22 sat per byte to be exact.
You get better fee than mine, I just requested withdrawal and processed instantly but so surprised to see the fee is only 5 sat/byte. Is this the effect of the last issue with BitGo? Previously their withdrawal fees were always above recommended by bitcoinfees21.