Backup hung and isn't writing any data

Hi All,

 We are facing issue with a server. Whenever backup starts running, VSS service gets hung and backup as well. Issue was fixed after rebooting the server. However this scenario is happening intermittently, we can't reboot the server all the time.Please provide a solution to fix this issue. I have attached bpfis and bpbkar logs.

Regards

Harsha