It's not new in this world . If you've joined this world for years I think it's very normal and Binance is not the only exchange did that. Coinbase is also do the same when the whole market pump or dump ). They often close their exchange to prevent investors and traders from buying or selling cryptocurrency at that time, although they announced that their website has some problems need to be solved but I don't think so cause these problems always appear when BTC and ETH price pump to a new ATH or dump to really low price ).