Unknown SQL Exception 10054 occurred

Hi , Daily exactly @4.00 am server have the below error in the Event Viewer.

" A transport-level error has occurred when sending the request to the server. (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host.) "

After couple of minutes will come to normal.

My assumption is during that time connection with DB server is closed by some scheduled job and reestablished again in 10 minutes.I have checked with DB team , there is no scheduled job for server restart. Then why it's happening daily.

Please anyone help on this error.

RameshNK