Outlook and Owa sometimes not work for user.

Hello All,

The existing environment is Active directory 2012 and Exchange server 2013.

Everyday some internal user (Randomly happen per day) not connect to outlook and also owa. When AD and Exchange server restart then those user were connected. Per day one/two times restart needed for this issue. I have already check AD health and Exchange health but not found any major error.

Please suggest.

Thanks,

Parvez