try lowering the MTU setting on the router....
default is 1492...I have solved issues with routers freezing up or not connecting to certain sites....and dropping connections by doing this.
http://www.dslreports.com/faq/695
do the ping test and see if the packets are fragmenting...then lower you setting by 10 til the packets stop fragmenting...that will be the optiiomal setting for MTU
Not sure why this happens.. but I think it is some incompatablity between modem and router....
In the PPPOE settings window on your router there maybe a area to lower this setting..
I dont change it on the machines...just the router.
Worth a try.
MLF
Edit> could be the router is flucked....you may want to try a newone.
Keep the box intact and buy it from a big box store...so if it acts the same...you can take it back...then call your ISP and start complaining.
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