Same here. I was in the middle of coding and testing my website when the file upload function stopped working suddenly. One second it was functioning properly, and the next, I encountered a connection failure. I am also unable to access the database or use the control panel. It seems that all websites hosted on the same server are currently down.
It appears that there was a short outage in the hosting platform resulting in various services being unavailable, including the file manager. This was fixed shortly after.