I have seen this a number of times.
One problem is I believe related to the hostlist file.
If you have got a file from someone else then your ip
could be in there.
I have watched the incoming and outgoing tcp
connection to my ip starting up, usually Xolox has lost a
host and has checked for others in the list.

Sometime after this the local loop back excludes more and more
connections until even your isp does not think you are online
any more. ( Software login security I assume you have )
I just have to reconnect to my service provider and its fine again.

That is untill you hit your host again.
Therefore try changing the hostlist file for another.
In a post some months ago I believe the developers were going
to exclude using you own host when you come across it in the
hostlist file.