Xfinity Stream App on Roku Soundbar: Service Connection Issues and Access to Mini-Guide

I have been experiencing a few issues with the Xfinity stream app on my Roku soundbar, and I was wondering if some of you guys might be able to shed some light on what could be going on.

One issue I noticed since I started using the app about 2 months ago is that the mini-guide very often cannot be accessed, and I am forced to exit the app and start it over.  Most often I access the mini-guide using the right arrow key on the Roku remote. However, it can also be accessed with the down-arrow key which provides access to additional functionality and features, and those are not available either. The back button does not work either, and I have to use the home button to exit the app. 

The other issue which started happening this week is the app not connecting to the service. I experience that 3 times this week already. It was not a network issue on my end as other streaming apps on the same device were able to connect to their respective services. A message I got in these cases was that the guide was not available as I was trying to access the full guide. 

The Roku soundbar has the latest software update, and it also has the latest version of the Xfinity Stream app. Is there some type of maintenance I should be performing on the app or device? The first thing that came to mind is that I probably needed to clear some type of cache. However, I didn't see an option for that. 

Any thoughts?