Try this: Log into your device and change the name of one of the networks. Doesn't matter if it's the 2.4GHz or the 5GHz network. Then you'll see both networks again.
I lost my Xfinity 5.0 GHz connection. Somewhere it asked me if I wanted to combine them into one. So I did and lost my 5.0 connection. I would like it back
You don't have the xFi Pods, do you?