SilasB, it may be other wires or interference. My suggestions; I would separate all the cables an inch or two including the motor/encoder cables if they are close (they are not twisted pair or shielded lines), Place chokes on all power and usb cable (or use a USB with a choke built in), My router was electronically the nosiest and got worse with a few hours of run time. So you may have been almost interfering when new, but over the limit with some router age. Don’t secure any cables close to any motor such as the router or Zaxis motor as they are noisy. See what other electronic devices are also on the same circuit and turn off to try, vacuum, lights, etc. I also had these timeouts and sled not keeping up errors at the beginning of my “shake down” runs but fortunately that is now a thing of the past. Only after trying these solutions would I suspect the Arduino as they are “mostly” stable. Jon