Recurring system.log process: "com.apple.dpd: Service exited with abnormal code: 75" - Catalina 10.15.7
Fixed! I'm not sure if there will be unintended consequences to doing this but I removed the dpd daemon from /usr/libexec/, which is a hidden folder (literally dragged it into the trash and removed it). No more recurring messages!
DPD in the Man Pages