I purchased 4 multipurpose sensors and 1 belkin switch. I was able to connect switch just fine however with the sensors, they just dont connect. I have connected few of them few weeks ago just fine. now i tried 2 out of 4 and they dont connect… the blue light keeps blinking and hub just doesnt find them. at first i thought the sensor if faulty, but then 2nd one doesnt connect as well. how can i restart the hub? how do i check the logs on the hub to see if its even trying?