I solved this problem on my end. Perhaps it will help others. This problem happens on my desktop only. When I use Firefox on my PC to listen. I have a dual boot machine and it was not happening on Windows 10 - Firefox. Only when I was using Linux Mint 19.2. I thought this was the issue, and there could still be something going on with the OS, but this morning I solved this issue with closing browser tabs in Firefox while Pandora was running. After closing about 5 tabs out of 30+ it cleared up. I have 32GB of memory but by all appearances this does not seem to be enough to cache all of these browser pages and run Pandora smoothly. When using Firefox in Windows 10, I did not have as many tabs open. Hope this info helps others. Good luck.
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