2.4 and 5.0 merged 5.0

5.0 is no longer in my availabile networks I've tried to put it in manually but it's saying connection test failed? I knew today something was wrong because it was buffering that usually happens if device goes to Xfinity or the 2.4 and I was able to change it until this morning as it was gone? Tech fixed lost connection but I still have no option for 5.0