The electronic systems of modern high-energy physics detectors are generally built with electromagnetic compatibility issues as an important part of the requirements driving the design of the detector. The CMS experiment at CERN has an appreciable amount of electronic infrastructure not usually found in previous generations of high-energy physics detectors. Over more than a year of CMS running, we have had the opportunity to observe several instances of unexpected interactions with infrastructure electronics. This paper will examine some mechanisms and consequences of these interactions, as well as considering the coordination of infrastructure and detector electronics design.