Trouble With Connecting

We are having difficulty with the connectivety of our system. There are two floodlight cams, one spotlight cam and a doorbell cam. We purchased devices from Amazon that were supposed to enhanse the WIFI signal, but at any given time, at least two devices show poor WIFI connections. I managed to program the floodlight cam lights on both floodlight cams to come on at 6:00 PM and off at 6:00 AM. But they are now off before 6:00 AM.