TC8717 5GHz Network Problems - Time Warner Internet

I have the Technicolor TC8717 Router and lately i've been having issues with the 5G network. It's a dual band router that always used to broadcast one 2.4GHz network and one 5GHz network. The 5GHz network no longer broadcasts even though the 5GHz light is lit on the router and the router gateway shows that the network is broadcasting. Any help?