Today ive had around 12 machines lose connection to the domain. Computers are XP SP3 but ive no idea why they have done it. about 3 weeks ago i moved all 3 DCs to 2008R2 so im not sure if that has anything to do with it. Ive checked the event logs on the 3 DCs and there are about 8 machines with netlogon errors ID5722.
I have been rejoining them to the domain and they then work but i dont know whey they are losing connection in the first place!