It looks like the issue that you are experiencing may be related to space issues on your device. Freeing up space on your device may resolve the issue that you are seeing. You can do this by: 1) Remove any unused channels from your device. 2) Factory reset your device. If you need assistance with this, steps are outlined here: How do I factory reset my Roku® streaming device? 3) Link your device back to your account.
Please be aware that after factory resetting your device, you may need to re-authenticate some channels on your device.