I have had similar problems with my 3dWifi. For a few months, I found if I connected old lower grade router I could connect to it, just had to have both smoker and phone on same network. Ultimately, after having the lower grade router off and the smoker off for a few weeks, I could no longer connect to the old router. I got really peeved and used it manually for a few weeks. Then I tried it on the new router and it was able to connect but oddly I could only use the app on the iPad and not on the iPhone, the iPhone could never find the smoker. I’m still using the iPad app as the controller. I have no idea how the smoker was finally able to connect to the new router. Or why the iPhone app won’t work but the same app on the iPad does.