I agree with ChasG. "Something" has changed after the recent updates. This has absolutely NOTHING to do with the network gear or isp's of the end user. Lets remember, this is a home automation control system, not a device to control nuclear reactors, so top of the line, rooted devices are unnecessary and not required for functionality. Granted, if the user is still using a router from the 1990's then they probably will have issues, but not just with Wink, but with basic internet access and security as well.
Case in point. I have a friend who is using a ST V.1 hub with essentially the same devices as I am (GE Link's & Leviton outlets) and he has had ZERO issues with usability and reliability. His network gear is EXACTLY the same as mine (I should know, because I set it up for him) and we both use the same isp. Before this upgrade, I was in the same boat as ChasG and a lot of other Wink users in that the system wasn't perfect but it was useable and half-assed reliable. But after this latest upgrade, useability and reliability have nose dived for a lot of us. Why? Who knows. But it is a concern for those of us that have invested in Wink products and now are dealing with a hobbled system.
As far as Wink providing a list of "Wink approved" networking gear, that is a slippery slope. Just ask Belkin when they went down that road when their Wemo devices were having issues. The user backlash was fierce, but also understandable. Here is a company selling a device for a particular purpose (home automation) but with the stipulation that it will only work with a particular list of routers. And seeing as Wink is only a one trick pony offering only a home automation solution, a statement of the Wink hub only being able to work with routers A, B, or C reliably would be the kiss of death for the brand, as there would be a dozen competitors waiting at the door to offer their home automation systen that works with every router brand on the market.