I've enabled a trace on your account to help further investigate. While this trace is enabled would you please try a few troubleshooting steps. Some of them it looks like you've already preformed, but I'd like you to try again while the trace is on.
First, check for an update to the Roku software: https://support.roku.com/article/208755668-how-to-update-the-software-on-your-roku-streaming-device.
Then, delete the Pandora channel from My Channels, and add it back from the Channel Store. When deleting, you should be asked to sign back in.
If available on your TV, please try connecting directly with an Ethernet cable rather than WiFi.
If you continue to run into trouble, can you please give me the time and date playback stopped and which station you were listening too.
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