This occurred sometime after Jan 4-- since at max Jan 5.  So sometime within the past 9 days (today is Jan 13) they seem to have disabled Deposit and withdrawals.

They seem to be giving updates of other coins maintenance on stocks.exchange Telegram chat, but searching back shows no BBR updates since Nov 2017 when they renamed XBB to BBR... I would suggest to at least open a ticket with them to inquire.  I'll let you know what they say if they respond to mine.
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I opened one with them 3 days ago about some lost bbr when depositing and I havent heard anything back yet. Ive went through their support before and they responded within 24 hours, so Im not sure whats going on. Ill also try to update if they respond to mine.