Today we noticed that 4 of our Azure VMs rebooted automatically. This was NOT triggered by us! Strange thing is that it also happened while we were connected to 1 VM via RDP.
Afterwards it took ~ 45 (!!!!) minutes until the VMs where available again. In the meantime the Azure Portal just gave the status information "Starting...".
What has caused this and how can we avoid this? Customers where waiting in that time and we had to explain why the servers were not available.