I have seen Netgear modems cause quite a few issues with ATA's connected, usually haveing the correct ports forwarded fixes it but not always.
Billion 7401 is a decent device, or if you can find one an Open 824RLW 4 port is quite good and very cheap at times too! (Being a rebadged Billion 7404) but I'd advise to stay away from the 3 port version.