I have several several s4's... I bought 2 originally and since I have a lot of smart devices I bought 2 more. Every month or few months. Ether the app crashes ( says it can't optimize or buttons missing) and it took me several months to even get 2/4 to update. I'm always fighting with these things. Now I'm missing my optimize button again, one my deco's don't even have any clients attached and now the only option I have is too reboot everything and walk around like a ......., hope they connect or what not normally happens is I would have forget each satellite and then re-add is back. This worries me cause if I go on vacation I always wonder if the whole system just gonna crash and I'll lose access to my security camera's, lights, switches.. etc... 

s4

Sometimes I really wish this system/app would just work!