Commented Feature: "+" gets disabled for unknown reasons randomly [4717]

Sometimes "+" is disabled for some reason and the only way to make it possible to add new entry again is to restart VS. Pretty annoying.
VS 2015 Update 5, Windows 8 Pro.
Comments: ** Comment from web user: alexandis **

Oh, there was new version lately. I've just installed it - will let you know, if some bugs would be reproducable... Thanks.