Thank you the fix above has worked.
If possible could you tell me where you think the fault lay, so as I can try to avoid it recurring?

So I have since reporting this been able to gain access to game and servers again.
But form what you are saying could experience same issue, whilst Units server is down or corrupted, up till the next patch is released.
Is this correct?
Also is there anything I can do my end to mitigate this happening again? E.g. remove myself from any active Units?

Thank you for response as it is good to be informed as what is going on even if it is not wholly positive.

Is there anything more you can suggest i try to help fix this issue which still persists? I understand you have many calls on your time but three days have passed and you have said nothing more. Meanwhile i cannot function as admin to my community or assist other players on the server with smaller glitches and bugs.
You have indicated previously that the problem lay in Arma files not mod files, so i would hope to have had some further response or suggestion by now!
With continued patience I await your speediest response.

Can i also add that having yet again repeated your re installation suggestion, that whilst i still cannot join any Epoch mod servers, it is also happening when joining Wasteland servers that require no pre loaded mods and is dependent on large mission file instead.
I can join and stay on Experimental Epoch mod and other game modes like KOTH and KOTH 1944.

Having followed your advice I was able to play yesterday in multiplayer with and without mods and able to join one Epoch Experimental server, but not long after joining the Epoch server i help administer and moderate, this morning, i again faced game freezing and only being able to close via task manager. I had also before playing deleted Epoch mod and re installed and verified game cache. I can only believe that it is either Epoch mod causing issue or something in server mission file. I hope you could help suggest any other measures or testing i could do to remedy this. Thank you for your assistance thus far and hoping for your continued support in resolving this problem.

Keep getting error from website saying format is not compatible so here is link to google drive where i have put folder full of the reports generated and I have bothered to save[[ https://drive.google.com/open?id=0B5-bgbHqkgTbeEZHM05iUzM2ek0 | name ]]
I do hope this can elucidate what is going on, as I have never had such a situation with Arma 3 before in over 3000 hrs of play. highly frustrating as i cannot help community members on our Epoch server and have had to withdraw from tomorrow's mil-sim co-op mission.

I cannot upload any report files other than the one given as page tells me it will not accept the file type, which is odd as that is the file format Arma3 saves the reports under. Please can some one help as i need this sorted so i can continue to play and administer the community server.