what Neil Jones said with limewire and ISP is crap they don't know if you are using limewire unless you upload. the problem could be you messed with the lease time in the router settings. go to the router setup page and set lease time to forever or something similar.
It is very easy for your ISP to block or throttle back limewire or any other P2P application. You may want to check this LINK
(LimeWire uses ports 6346 and 6347 Neil
As far as the IP address lease expiring. That would have nothing to do with the situation described here. When the lease expires, DHCP requests a new IP address seamlessly so you would not be affected.
Also please note the following points:
1) forever is not an option
(you may be able to set your PRIVATE LAN IP lease to unlimited; however, If the WAN IP lease expires, this is set by your ISP and you have no control over it.
2) It would not be affected by running an application
Edited by brianmil0923, 16 October 2005 - 10:41 PM.