Hello,
As for the Slider Revolution AJAX error, yes, we face the problem from time to time. In most cases, this error was caused by the server configuration. Some permissions issue on the server since it doesn’t allow AJAX request. Please contact your host support on this issue as our theme does not influence or cause the problem.
As for the Contact page. I have deleted all the rows and columns which contain WP Bakery Google map and the page is saved correctly. We need more time for investigation of the reason. I am checking the same on our side it works correctly even with the Google map. While we are looking for the reason, please check and make sure that the address code inside the element is correct.
Best Regards