My video upload have been failing recently with the error

"One or more of the specified parts could not be found. The part may not have been uploaded, or the specified entity tag may not match the part's entity tag."

What could be the issue? I have tried using two different internet networks to check whether it is an error with my network. The upload is failing in both of them with the same error. I already have uploaded many videos before. This is the first time these errors are coming.