Tables in Word Docs Stored on SharePoint Breaking

Custom Table Styles are breaking in Word documents stored on SharePoint. This started a week ago after a recent Office update. A solution of having only one person editing the document at a time defeats the purpose of SharePoint collaboration. Always editing in the desktop app is not a reliable solution either; not all tools are available in the browser. Tables break and fix themselves without intervention - sometimes in the desktop app and sometimes in the browser. Any insight is appreciated.