Sorry the hear you are experiencing issues. Could you please give us more info about your system so that we can help you more. Before you start, could you please also make sure all roon software is updated to the latest version.
Is the core running on Mac crashing? which mac version is it? what error message you are seeing?
Can you please install our latest update, Build 918, and send us an update? You can do this by going to Settings>About>and clicking the link in the Core frame. Thanks!