All my deposits comes from other exchanges binance and two biggest Turkish crypto exchange. And worth of my funds was lower than 2000$ at the time of suspension later i deposited more because i wasn't aware of suspension.
no idea what might have triggered it? have you deposited lots of funds in the past? what about trading activity---what tier are you?
i hate to hear this about kucoin. just about every other exchange is doing these KYC questionnaires by now, but this is the first i've heard of it with them. i regularly trade there (unverified, USA) and haven't had any issues myself.
the only thing i've noticed that changed recently is that they now allow 3 accounts per 1 verified user. used to be no multi-accounting allowed.