Do you believe the cabling to be the cause of failure for loopback mode?
As pointed out in the FAQ, these low evel errors do not represent data errors at the application level and often just lead to the packet being resent. So unless you are getting huge numbers of these errors it is likely that the error will go completely unnoticed by other USB devices.
Benchmark mode doesn't report on transceiver errors. But if you have a lot of transceiver errors, you might notice the throughput being slightly down on what it should be.
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