4.1 server regularly 'pausing'

[Glen001]

I've had this at regular intervals over the last week

My game will 'pause' - I can move around but my bots have stopped, NPCs have stopped, no feedback from game.

I remote into the server and see hundreds of these messages scrolling up the server screen:

Atfer a couple of minutes the client will spring back to life, those messages have stopped on the server screen and everything is ok for a couple of hours.

Then it happens again.

Any ideas?

 

[Glen001]

I thought that maybe it was items on the AH that were causing this issue, so I turned off the AHBOT this afternoon and deleted all AH items and the pausing issue hasn't happend at all this evening.