itunes no longer recognizes audio cd for import on mac
I buy a lot of CDs at music festivals and import them into my itunes (now Music?) library so I can listen to them anywhere. Suddenly (it's been a few months since my last import), itunes does not recognize the audio cd. Interestingly, the audio cd pops up into the itunes browser for about a second and then disappears. I've tried this with multiple new CDs (and some that are new to me but I bought previously owned) and none of them are appearing. I am on a mac. Help!
MacBook Pro 15″, macOS 10.14