LimeWire Connection not Sticking

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Hi all,

My LimeWire connection does not stick and is not stable, in the connection bar (bottom left hand corner of console) the connection indicator keeps dropping to 3 bars then goes up for around 30 secs then drops to 3 bars again and so on and on!
I have upgraded to the newer versions twice recently as this was happening in the older version and thought that may solve the problem.
I have upto 8mb Broadband, WinXp and running McAffee Anti-Virus with the standard Windows Firewall, but don't have any problem with downloads well only when the connection bar drops then so do the downloading files.
What can the problem be? does anyone else experience this?
I've also contacted my ISP and there are no issues or connection problems with my line.

LimeWire older version (can't remember what version) the one before last
I did not have this problem, it was solid as a rock, so it was since upgrading these last 2 times (if all that makes sense)
Help!!!!!