I've got a jlink connected to a mcu. Was running a long duration test, connected through jlink ultra. Was communicating through RTT from laptop. After 30 hours or so, the middle led turned red. Was unable to communicate anymore. I plugged/unplug the part of cable which goes from laptop to jlink. Worked after that. What could cause this issue? How long can I use jlink continuously? Ideally I would like to remain connected for hundreds of hours.