Xfinity Stream app on iPad - video freezes, sound continues, crashes iPad

Lately my shows will freeze video, but the sound continues.  So basically I'm "listening to a radio show."  😉  When I try to fast forward, the video stays frozen, but now I'm listening to the show further along.  After a while, the whole thing crashes my entire iPad.  I have to reboot.  I've tried deleting the app, reinstalling, but the problem persists.  Also, at one point, the app was stuck in Downloads mode even though I was connected to the WiFi.  HELP!