Within.the last week I've switched to the newer model Apex mainly because I've also switched to Sky's. But I'm getting a lot of send failed messages when programming different outlets. Doesn't appear to be any rhyme or reason. I don't know that I ever got one with the classic is it a wifi issue? I would find that hard to believe because the router is in the next room maybe 20' away and it showed full signal on setup? It's terribly annoying.