Hi all,
I have had exactly the same problem and due to another post which someone mentioned ZoneAlarm being the problem I have investigated and have found the following has worked (or has so far):
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Go into ZoneAlarm
Select IM Security
Select Settings Tab
Click on Advanced Box
Remove Tick from "Block IRC"
Click OK and sign-out of ZoneAlarm
I have no idea what IRC is but I did this about 15mins ago and have held a constant chat ever since without any failures (here's hoping it lasts!!) .
Good Luck
Hold The Press ..........................
As per usual I was led into a false sense of security..............a while after posting it started failing again !!!!
Appologies for getting anyone's hopes up reading this.
Next step...............Zone Alarms coming off ...........