Hello @Thomas John
Please add more details.
Are you using Server, Datacenter or Cloud?
Are you using collaborative editing?
What is the error message in the log?
With you one liner nobody will be able to suggest something to you.
Someone with an equal problem was suggested to open a ticket with Atlassian: https://community.atlassian.com/t5/Confluence-questions/Lost-connection-can-t-edit-Confluence-page/qaq-p/1589286
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