Chromecast and playback Issues

Love HBO. Just cant do this app anymore. Unreliable Chromecast. Freezes on my phone so that I cant turn phone to watch widescreen. That leaves me watching top left corner of the full picture. Sad.

Update. Fixed one problem. Now an even worse problem. The update fixed the Chromecast issue. Which I appreciate. But now it gives me do much trouble logging on! I go to Xfinity and it takes me to a weird page where it asks if I want to buy HBO. Doesnt even ask for my account sign in. There is none! So after awhile I erased the app and started fresh. Now I cannot log into account at all. Havent been able to use the app since.

Sof and Dad about HBO GO: Stream with TV Package, v13.0.0