jellievis, perhaps you should RMA that W8960N if you still have it.
I've seen quite mixed experiences the past few months with both the D-Link DSL-2750U and TP-Link W8960N, where they would either work flawlessly or they would act up horribly. Usually when the myBB user returned the device all the problems was solved though.
Even though I've seen mixed experiences for both of them, I'd still recommend them, because they're the best value for money and their ADSL noise margins are very good.
If I'm not mistaken, the Netgear DGN2200 also has very good ADSL noise margins, but it costs quite a bit more and you don't have all the advanced ADSL features (such as bridge mode) like that you get with the TP-Link or D-Link modems.
I think overall people have less issues with the DGN2200, BUT they often run into situations where they want to use bridge mode and then that modem does not support it...