I have this exact same problem with one of my stations. Works fine on laptop, won't work on Roku even after reinstalling channel.
After noticing that the station was playing fine on another Roku device, I realized this was specific to the one Roku TV I had. Not sure if this did it, but I managed to get it working again by going to another station that was working fine and hitting the pause button so that it stopped playing. When I went back to the station that didn't play, an ad immediately started playing, and after that, the station returned.
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