I had an issue in which the message: "An exception occurred in the client script. Error: The connection to the server was reset" appeared after i tried to export to excel a record list using the download action. The link associated with my action was Ajax Submit instead of just Submit. This was the cause of my problem, so if you just change your link to Submit, your problem should be solved.
Just to let you know in case you encounter the same problem.
Indeed, Excel downloads are not possible with an Ajax Submit. This is, as I understand it, a technical limitation, not of the platform but of the browser/HTTP protocol.