It happens. Even the biggest sites like 5dimes go down time to time.. and overall, bitbook has had pretty good uptime.  More importantly, never any issues with payouts, so bettors should be forgiving when it comes to a little incident like this. Good luck with the maintenance, I hope it doesn't cause too much of a headache for ya'll. I'll keep my fingers crossed and hope it is back to running smoothly in time for tonight's NBA