They've issued a statement denying problems, which of course has alarmed everyone even more:
https://www.gate.io/article/30962
Recently, there have been rumors circulating regarding Gate.io. We would like to clarify that our operations are running healthily, withdrawals are functioning properly, and there are no issues with our operations or withdrawals as rumored.
Their token, Gatetoken, is in freefall:
Some people have hypothesised that Gate.io is exposed to the ongoing problems at Multichain (whose CEO has been arrested in Shanghai.
No-one knows how true these rumours are, but if you have tokens on Gate.io, it might be wise to withdraw them till the situation becomes clearer. No-one ever got poor taking basic precautions.