We intermittently experience issues with our Cubewise Application Server service on our development server. Today, for example, the service is constantly using around 20% CPU for no apparent reason. There are no other users using it.
This means Canvas is just failing to respond via a browser - not loading pages, not saving actions, etc.
After restarting the service Canvas will respond for a minute or two, but then starts churning the CPU and failing to respond again.