Synology as Core works fine, but with an error every 30 seconds

I just set up my Synology DS718+ (with an external SSD) as my Roon Server, and it’s working delightfully at streaming to my Sonos players. What a great experience Roon is!

However, I am getting the following error (“System Event”) on my Synology, once every 30 seconds or so. It doesn’t seem to interfere with streaming, but is annoying and clogs up my notifications:

“Music or videos don’t play or display properly because the given codec is not successfully activated. Please check your Internet connection.”

Any ideas? Thanks in advance!