Thanks for reaching out. Try uninstalling & reinstalling the app to see if that makes a difference (Note: You'll lose your offline saved content by doing this). Also, check if it's the same when you try switching network from WiFi to mobile data. Keep us posted.
Appreciate the report. To help the right team better investigate, please send a feedback report from the device you're having the issue: https://goo.gl/WdI0BK . You may not receive an individual response, but the details will help us identify and fix any issues. Thanks.