I too am having this problem - max 5 peers - but ONLY after i installed a router this week. (Voyager 205)
Previously I was using a voyager 105 usb modem only and LW was working great - absolutely masses of connections and always turbo charged.

I have altered the options/advanced/firewall and set it to manual without doing anything to the router etc and I find that all my connections come back, but the speed never gets above good or occasionally excellent.

I guess its about configuring the router but no-one seems to know the formula for doing it.

Any ideas/help?