Music on Hold broken, but no MOH set up

Hi there. Working with an AsteriskNow box that was “converted” to FreePBX (we installed commercial addons). Recently, the streaming we had stopped working; about 3 days after upgrading from FreePBX 11 to FreePBX 12. We were using a streaming application similar to:
/usr/local/bin/mpg123 -q -s --mono -r 8000 -f 8192 -b 0

However, these started getting dumped into
WARNING[20141]: res_musiconhold.c:701 monmp3thread: poll() failed: Interrupted system call
About 20/second. I deleted all of our streaming categories, and all other categories so that only the “default” category remains. I’m still getting these errors. What’s going on?