Not sure if this is a bug... However once I choose wifi, it should stay wifi.
Optik on the Go warns me if I'm about to use cellular data. There is no warning if I'm using wifi. I discovered a bug where if I start Live TV with wifi, but walk into an area of poor wifi... there is NO warning as it switches to cellular.
For those wondering, it's around $17 per hour to use Optik on the Go on cellular. Until a fix is presented, I recommend disabling cellular when using LiveTV.