I have Word documents that we are working on in Teams. The document template has a table style that used for most tables, and this is set to have the header row repeat. Sometimes, at some stage, a document will stop honouring this attribute. When you close and open the document, none of the tables have repeating headers. If you click on them and apply the table style again it's fine, but close the doc and open again and they're once again not repeating.
I believe this is a Teams/SharePoint issue and I've had it on both platforms (SP and Teams environments) for years. I don't get this issue working off a local copy or a server.
