Sinbad.io Mixer has always been shown as a mixer with enough bitcoins so I don't think the financial situation is the reason,
I am of the same conviction that Sinbad has no problem with finances. Of course, maybe this current maintenance is not the best handled, but even here we can only guess the reason and the seriousness of the situation that their team is solving.
Based on what the campaign manager wrote, we now know that they are also fully aware of the situation and how everything looks. However, in two days they should have more information about the current situation as well as about the future of the Sinbad service.
Wow, hugeblack nice avatar
They are back. Wallet address was filled up.
Balance looks topped up now , happy days for everyone..long live Sinbad 
Current balance: 0.08602322 BTC