My surface element has to be "jiggled" or pushed in... (by 2 users)

Modern surface elements are plug in....the element plugs into a receptacle. The connection between the element ends and the receptacle can become loose or burnt. Remove the element and check out the end connectors, and with a flashlight look at the receptacle condition. If the ends of the element or the receptacle look pitted or burnt = replace them. Picture help below.