This happens to me as well, on Roku XS, only the Adult Swim channel.
The Roku 2 XS (model 3100) was released in July 2011 and is no longer supported by Roku or most channel providers. It is vastly underpowered compared to the current models and is incapable of running some of the latest channels. I have two myself, and stopped using them more than three years ago, maybe even longer. More than likely it simply doesn't have the performance to properly run Adult Swim. I'm sorry, but there really is no resolution other than replacing your 3100.
Roku Community Streaming Expert
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Please be aware that the Roku 2XS is a much older device. However, we would be happy to see what we can do to help get you back up and running.
Please feel free to send me a PM with your Roku account email address and the serial number of your Roku device (printed on the side/back of the device) and I'll have our support team reach out directly to assist you further.