What kinds of devices are you unable to control and how are you trying to control them? E.g. zigbee devices, Z-Wave via app X? The actual devices involved and the drivers being used may also be useful.
Also what platform version are you running, e.g. 2.3.x.y
My suspicion would be you are having issues with one of your z- mesh networks, which, if true, would explain the shutdown and power off working compared to just rebooting. But that is just a guess.
