Unity freezes when TCP connection lost

Hi guys,

We keep having an issue, where if we use TCP photon connection, once a disconnection is identified, unity freezes and refreshes only once the PeerStatusCallBack is called (after the unity gets back from stalling).
If we connect with UDP, this does not happen. That's the only change in the client when changing protocols.

(We are using Photon 2.6)

What can cause this?

Edit:
Here is the exception photon generates:
---->ERROR: Listener debug returned: Receiving failed. Exception: System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host.

at System.Net.Sockets.Socket.Receive (System.Byte[] buffer, Int32 offset, Int32 size, SocketFlags flags) [0x00000] in <filename unknown>:0
at ExitGames.Client.Photon.TConnect.Run () [0x00000] in <filename unknown>:0
UnityEngine.Debug:LogError(Object)
PhotonListener:DebugReturn(DebugLevel, String) (at Assets/Scripts/NewScripts/ConnectionService/PhotonListener.cs:42)
ExitGames.Client.Photon.<>c__DisplayClass2:<EnqueueDebugReturn>b__0()
ExitGames.Client.Photon.TPeer:DispatchIncomingCommands()
ExitGames.Client.Photon.PhotonPeer:DispatchIncomingCommands()
ExitGames.Client.Photon.PhotonPeer:Service()