Your PROFILER was in our Service Center initially because of a perceived power amp issue you reported, which could not be reproduced nor measured. You had provided the information, that this issue only affected the SPEAKER OUT and not any other outputs. Is there still such an issue?
When the PROFILER was already on its way to our Service Center because of this power amp issue you raised an additional request to check the PROFILER's Ethernet port because of Remote loss of contact issues. The Ethernet port of the PROFILER has also been tested and measured without finding any defects. If you are absolutely sure, that your Ethernet cables must be in order, what about the Remote? The Remote has not been checked. I guess, if my colleagues had known about this second issue, they had asked you to send PROFILER plus Remote plus cable. The way you describe the issue, it cannot be hard to identify the trouble maker and fix it. So I would say, you didn't give it a fair chance.
Perhaps your have access to another Remote ... a friend, a colleague, a shop? I would still try a third cable, perhaps a short off-the-shelf cable. And I would check the contacts at the Remote side.