When you say isp number this is actually IP address, and many peoples' including mine change every very regularly and often! So the fact you have been given a new IP address is nothing unusual.

Looking at your upload problems, it might be worth checking your connections tab in Limewire (If the option is greyed out go to View>hide/show, and select connections) If you are connecting as an ultrapeer, dissable Ultrapeer capabilities in Tools>options>speed. This should not be necessary if you have a very fast connection, but see if it makes a difference.

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