Z-wave devices like switches. But the last few weeks I'm having several devices stop working. I have 2 Z-wave door locks that won't stay connected. One just won't connect at all and the other keeps going off line and then back online. And there are several other switches that stopped working and won't connect. I'm wondering if there is some SmartThings update that is causing issues, because it seems unlikely that all these devices would suddenly start failing at the same time.