Unfortunately youll have to anyways to replace it if its buried. It absolutely sounds like a bad cable/connector though. If you are tech savy you could put a new rj45 connector on your cable but it requires special tools and really good eyes (thats why i buy my cables!).
From the black box you have a cable with small connectors, and then an adapter cable with one small and one large connector that would typically go to the head unit, its about 2-3 foot long. Im not sure where your extension is, i am not familiar with the livescope extension.
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