Cast Button Disappears

Like the app when i have my cast button. At times the cast button will disappear. The only way to get it back is to uninstall the app and re-download. Very frustrating!!! Ive tried everything to fix this issue. I have iphone 8 and cast directly to my tv. Need app for Roku asap. Old school youtube app works flawlessly with cast. Not sure whats goin on with Youtube TV app

ChefDevo84 about YouTube TV, v1.11.5