It seems like it's some sort of scheduled maintenance or.. something.
Another forum I'm a member of used to do that all the time.. vBulletin software. The forum would go down at a specific time (If I recall somewhere around 1 AM my time usually) and be inaccessible for maybe 15-20 minutes then come back up. I've forgotten what the problem was or why it was doing that.
Seems like the same thing is happening with AllDeaf. I wonder if Alex needs to do some pruning- as the forum gets bigger with more and more threads, the load time will slow down and get laggy as time goes on. Just my perspective. I don't claim to be an expert
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I've only seen it happen here once so far.