I have a Mac Work book and a Mac Mini – both run Catalina 10.15.4. When I try to back up my 2nd Gen iPod Touch to the workbook in recent times it fails with a message of Synchronisation stopped because link with device was lost or similar. Same process works fine with Mac Mini and iPod Touch backup up fine. I've tried full reboots of the Workbook and the iPod, changed cable s [always Apple ones] but still no luck. Can anyone suggest a cause and or fix?