I will likely be doing the same once my period is up, it is easy to replicate the issue, by simple torrenting for example with DHT and UTP enabled then sit and watch pings the wired and wireless connection entirely drop for minutes at a time. Other applications such as DCS updating as it uses tor traffic have the same problem with no way to work around but to wait until its finished, but they won't acknowledge or fix the issue.
Annoyed too as I did not want the SH3, and wanted to keep the SH2, but was told I needed it to go to 200mb from my existing 100mb, this turned out not to be the case as SH2 works fine on 200mb, and then I had several months of arguing over the phone with the CS saying they would refund the initial cost of the box, and then pretty much accused of being a liar later. This is modem mode too, its simply not a fit for purpose product