WiFi ... We deal with it every day. Door Locks, Thermostats, Lights, digital communications... You most likely need to boost your wifi signal around your house.
Some manufactures don't put robust WiFi in their products. I guess they save money this way.
Some of the wifi routers supplied with internet services are very weak. There are several new plug extender options available. More and more of these are coming on the market now with all the home automation out there.
Linksys makes a wifi router just under $300 that is just about maxed out with power. We have solved a lot of issues with them so far and you rarely need other extenders with them. Not to just push Linksys though, lots of good products out there now for this purpose.