If your gear 2 seems to not work well after installing new apps, please try rebooting the watch. This sounds basic, but it is a step that is often overlooked (ok, at least by me!) .
For example, I loaded about four-five of the new (paid & free) apps that have appeared on Samsung Apps website. After that, I suddenly noticed that my watch would not respond to "wake-up" motion. (Raise my hand, but it did not turn on, I had to press the home button).
I first thought that I would have to uninstall some offending app! However, after rebooting the watch. ..all worked well. ("Duuh"
This is a simple step that one often forgets. So, if your NEO seems to be sluggish or unresponsive after adding apps, reboot after loading (at least several) apps. . . . It solved the "wake-up" problem for me!