I personally deposit and withdraw frequently an amount around 10K without any problem for so many years. I think I encountered same issue like yours one time when I first submit my KYC after they requested it. I don’t experience manual withdrawal since then even though I do frequent withdrawal and deposit like yours.
Probably you accidentally initiated a withdrawal without completing the x1 wagering requirements or there’s something suspicious on your game style that’s why your account was put under review. Once they finish the investigation, I believe you don’t need to undergo the manual verification.
Btw can I know your username? Are you participating on the tournament?
I am very careful with at least 1x wagering before starting a withdrawal so I don't think that's the problem, KYC was done day 1 before I deposited any money too. I did have a few 5 figures withdrawals yesterday so maybe I am over some kind of threshold, I went through manual check once on bitcasino too but that was only 40 minutes, hours on livecasino was not what I expected.
Anyways I will wait for their official response, maybe I am just not welcome by this company who knows. I was just restricted from getting any reward/rakeback on bitcasino too after getting to hero level (but I can still play, strange...). (BTW I checked with support on both sites that playing on both bitcasino and livecasino is allowed)
I just started on livecasino, if you check the tournaments leader board I have been the first for the last 3 live game tournaments, for the ongoing weekend tournament I have 440k wagered (with the 20k deposit).
There is now an interesting twist, when I went to check my tournament scores I saw an "Ad hoc cashback - USDT (WRx0)" reward of $6400 deposited into my account, this should not be the monthly cashback since it's not yet "first weekday of each upcoming month by 17:00 GMT" per the monthly cashback term. I checked with live support and they said my account is ok and I can withdraw that cashback without wagering so I started another withdrawal request, what do you know I am now back in the manual processing queue for the third time....
I don't consider this reward my money until it hits my wallet so I guess I can be patient with the check this time and let's see how long it actually takes and what comes out on the other end.