There is a complicated bug that sometimes causes a leak, and eventually interferes with database connections. This is fixed on v0.9.0, but the fix is caught up in a major rewrite of App Streams.
There's a good chance the v0.6.1 patch will be out by then.
The server will be inaccessible starting soon. I'm hoping to be down for 20-30 minutes at most. See you on the other side!
There will be some downtime in the next few hours while the server undergoes maintenance and upgrades. Will post again with specifics.