Unstable connection when in Cruiser

[RipShredder]

Now this is something i'm asking for a friend of mine. He doesn't have a forum account nor is he particulary strong in formulating himself in english.

Whenever we play together and log into our cruisers he seems to get a very unstable connection to the server and thus getting kicked constantly. It happens during fighting, after fighting, during missions, travelling on docking approaches... It can happen in all situations and there is no pinpointing exactly why it is happening and therefor i'm asking for some advise.

It's only the connection to the server that gets unstable as we are in constant connection over skype at the same time. Some information of his specs:
20/2 mbit ADSL line
win xp
kaspersky internet security (from what i can understand this is only a problem with Vista and i'm running it too without problems)
his machine specs far exceed those required for the game and a dxdiag can be posted if requested.

Anyone suggestions here? I thought i'd ask now before someone thinks he is cheating and using F1.

Character names affected:
Guard_Joseph.Lindforce
Gunforce

From all of his characters, only those 2 are having these issues.