Hi @pat fern and welcome to the forums...
Could you provide a little more detail relating to the crashes and freezing you are experiencing with Affinity Publisher and let us know whether this is happening on Mac or Windows and also which version of the OS you are running.
If you could also let us know at what point Publisher is crashing and/or freezing that would be reallyhelpful, is it when simply launching the app or when you try to open a particular file? If the latter does it happen with all files.
Are you getting any error messages when Publisher crashes and are you able to upload a crash report?
The more information you can provide the better placed we will be to help you resolve the issue.