My website was down for the best part of an hour yesterday, between 15:30 and 16:30 UK time.
I contacted the hosting provider, but each time they looked at the site it was up, so they close the ticket. The fact that 30 seconds later it was down again does not seem to worry them. I asked for something a little more substantial than, “It’s working now. Your ticket has been closed”, but unfortunately it was not forthcoming.
Since that incident it seems to have been stable. Fingers crossed, whatever it was will not happen again.