As the title says, DC voltage was applied to the coaxial connection. Problems that have occurred, download speeds drop to 0 - 2 MBPS, the 2.4Gig connection to my thermostat loses connection. All these are intermittent problem, sometimes it works wonderful other time not so. Usually unplugging and plugging back in after a few minutes clears the problem.
Have run this through ChatGTP, it suggest that some damage is likely to have occurred.