Control boxes? What are you using? About the only thing I use is the computer interface. I'd have to go look and see what my controller is, I updated a few years back since Win 7 was not comparable with the ancient firecracker control I had been using. I do have a few remote control units around the house but I don't use them much. I do use a Slim Switch for some of my kitchen lights all the time. I went through a number of coupler repeaters over the years, hope I don't jinx the one I have now, it's been great. Had some problems with it, but found I had the DIP switches set wrong.
I started using X10 years ago to control my christmas lights. We put a candle in each window and I got tired of turning on and off 30 candles. I only use the plug in modules usually one per room. I do have a number of wired in switches around the house though. Initially they were problematic too, but can't say I have had an issue in years. X10 may be old but for me it's reliable.
In thinking about it, a year or two ago when I did my fall cleaning I checked and often redid many outlets in the house. I checked for loose connections and grounds, replaced worn outlets and pigtailed the connections. The house was built in the mid 60s and they used the push in typed wiring connections on all the plugs and switches. As I pulled them out I'd redo it with pigtails even if I did not replace the outlet. That may have had an impact on my system. I did find many loose and bad connections. Actually had one in the kitchen that had overheated and burned but somehow did it in such a way it still made contact.