CAX80 won't work at all on WOW Internet; firmware update ruined it

Sounds like we are having the same problem. I was using the CAX80 for one year with WOW and it was great. Really liked the features of the unit. All of the sudden a few days ago, no internet. I rebooted nothing, called WOW and they sent refresh signal. All lights are solid, looks connected, wifi lights good, WOW says it is connected, but nothing works hardwired or wifi. Did a factory reset, same issue. Had the extended warranty from Bestbuy, they swapped out, tried a new CAX80, same issue. Tried the C7000v2 no problems at all, everything works great so it was not the cable line. Tried a third CAX80, same problems, looks connected, shows connected on WOW's end, but nothing hardwired or wifi works. I know it is connected because I can send a refresh signal to the unit from my WOW account too. I really liked the CAX80 a lot, not sure why it would stop being compatiable after a year of no problems. Remember I tested 2 new CAX80's and the same issue. When not connected to the cable line, the unit will reboot every 4 minutes, so not much time to access the setup page. The C7000v2 is working great, but I would really like to have the capabilities of the CAX80. Everytime I want to try a new modem it is time consuming, I have to have WOW add the MAC to the account and my family goes nuts if there is no internet. Any ideas why this would happen all of the sudden? Any solutions?