Hi Guys,
A brief history: I have Lync 2013 with and Edge server with Office365 Hybrid . I have configured ADFS (single Server) and Dirsync for federation and Password sync. I have managed to get the hybrid work and even migrated a user from the On-prem Lync pool to the Office365 Lync Online. Presence, IM,audio and video worked fine for the first few days, however, I now get the above message/error (Lync 2013 Hybrid the connection to the server was lost.reconnecting...current calls may continue, but with reduced functionality) on the On-prem Lync user whenever he tries to get Presence status,IM,Audio or video communication, to make matters worse if the Online lync user is apart for the favorites on the on-prem Lync user's profile, the on-prem lync user continuously gets that message.
Your advise and support is highly appreciated.