If you are unable to resolve the issue and are only experiencing the issue with the HBO Max channel, you'll want to contact HBO Max support directly to inquire further. Many channels on Roku are developed and maintained by the channel provider themselves.
Try removing the channel from the Roku home screen by navigating to the channel tile, pressing the * key on your remote and choosing 'Remove channel'. Then restart your device from Settings>System>System restart. Once your player starts up again, add the channel back once more.
Does this clear up the issue you are seeing? Please keep us posted what you find out.
Hello there. I signed up via the free trial offered via Roku. Roku would, per offered help, need to handle resetting. At this point I am so fed up with this problem and am ready to take the Roku device back, or just throw it in the trash. Thanks!