If you cannot connect with your smartphone, you may want to try the following steps:

1) Reset the camera(s) from within the application and restart the complete initialisation of them;
2) Check that your camera is properly positioned inside the radius of action of your Wi-Fi network;
3) Completely delete them from the application and reinstall them as new - After each reset, wait for around 15 min before reinstalling;

Make sure you use the correct application. You can find which app to use in the user manual.

If several products are involved in this disconnection, it must be a different problem. You may want to do the following verifications:

1) Check that there are no other wireless devices nearby;
2) Test your products on another Wi-Fi network if possible;
3) Restart your internet router;
4) Contact your internet provider to check the settings of your new router, if that is the case;
   4.1) You can then check with them the power of your firewalls, the coding keys (WAP), port opening, frequency of your Wi-Fi (2.4 GHz) etc.