Connected No Internet 2.5MHz

Last gateway failed and Cox store replaced with Technicolor PW8.  the 5.0MHz signal works but cuts out sporadically. I continue to get errors on all 2.4MHz equipment.  All show they are connected and have no internet.  The Cox WiFi app can see them as connected.  I also tried splitting the channels to no avail.  I thought they gave me a bad gateway as it show historical connections so I returned and replaced it.  Completely frustrated at this point.  I did verify that the 2.4MHz equipment was still working when I used my phone as a hot-spot. Does anyone have any further suggestions?