1.9/1.9.2 Repeatedly having to relaunch client to play a different server

I've been using 1.9/1.9.2 and since I've been using them I have to repeatedly shut down my current client (after playing one server) and relaunching a new 1.9/1.9.2 client just to join a different server. I don't know if this is a bug or something up with my actually minecraft installer. (I've deleted and reinstalled MC, checked my graphic's card incase too) I don't know what else I can do to solve this issue but its beginning to get really annoying by taking up most of my time relaunching everything :/