Hello johnfromventnor city.
Thanks for reaching out to Apple Support Communities. I understand that you are having an issue using Safari. I'm happy to help you find a resolution.
Here are some resources that can assist you with troubleshooting:
If an app freezes or quits unexpectedly on Mac
Safari troubleshooting on Mac
Please let me know if you still have questions after reviewing the articles. Also, can you tell me how long you have had this issue? Do you receive an error message when it Safari disconnects? If so, what is the exact error message?
Have a great day!