OK I tried uninstalling BattlEye, that let me stay on longer but I noticed a message when I got booted.

Note: File blocks can be ignored if they don't cause problems with the game
[INFO] Blocked loading of file "C\Windows\assembly\NativeImages_v4.0.30319_32\System.Web.8dc504e4#\07921356a37b75645656bc7955f390f7\System.Web.ApplicationServices.ni.dll"

Is this the problem and if so how do I fix it?

Tried again, same server with my AV and firewall disabled. Still booted within 5 minutes.

I will try those but it just seems weird that I have no problems with any other server based mulltiplayer games I play. Only DayZ.

Just tried it at home again, booted off within 5 minutes of logging in. Server ip 81.19.208.44:2330

I could try moving my PC to a friends house but I'd really rather not do that. It's a lot of work.

It isn't intermittent.

Yes but everything concerned with DayZ is trusted. The game, Bohemia and BattlEye.

No, I am unable to do so as I don't know anyone local to me with a good enough PC to run games.