Thank you for your time answering my question. (I am not computer literate. )

The Apex AquaController app on my phone is not working correctly after changing our old modem to a new modem this morning.

Apex Fusion is working fine, and I can control the Apex through that, however, the AquaController "Apex" app on my phone varies between a red dot (no connection), to an orange dot (I can see what is running and see graphs but no control.).

An error message appears under the opened app, "Apex could not connect to server.".

The Fusion app on my phone is working fine.

The apex on my tank is connected via an Ethernet cable.

Any suggestions?