Word error We're having trouble connecting to server. If this keep happening, contact your help desk.

In order to resolve the issue you could try these steps outlined within the article to repair the affected report document.

https://support.microsoft.com/en-us/office/open-a-document-after-a-file-corruption-error-47df9d48-2165-4411-a699-1786ac734bc3

1. Click File > Open > Browse and then go to the location or folder where the document (Word), workbook (Excel), or presentation (PowerPoint) is stored. ...
2. Click the file you want, and then click the arrow next to Open, and click Open and Repair.

Note- Save the Repaired version of the word document locally within your system.

• Within Report manager> draft>locate the report >edit properties>and upload the repaired word document as new version of the report 

• To edit the report’s details, in the same report drop down menu click on Edit Properties.

• To upload a new version and replace the existing report, click on Upload new version, at the top of the page, under file name.
• This should fix the issue and you should be then able to open the report document without any issues