Looks Exchange Deposits/Withdraw are working fine again. Hope to see no more issues again.
Successfully got withdrawal of 120 DERO at a time.

Update: Got Withdrawal error on 220 DERO. CryptoNote Protocol locks amount for next 10 blocks after every transfer. Looks Exchange need to approve withdrawal after calculating wallet unlocked balance rather than wallet balance, they should wait for approval for next 10 blocks till wallet gets balance back again for transfer.