Hi, is it possible that an USB 3.0 cable to start, out of the blue, to deliver only USB 2.0 speeds and then recover on its own? Basically what happened: when transferring some files to an external drive, through an USB 3.0 port and an USB 3.0 cable, I've noticed that the transfer speeds were about 30-35 MB/s, a bit slower than what I would have expected (50-70 MB/s). This occurred twice and, at first, I did not pay attention to it, thinking the files were fragmented or something like that. But a third time, I had a feeling something was unusual. So, I tested transferring those files with another cable (using the same external drive and PC) and the speeds were 50-70 MB/s as they should have been. I tested the suspect cable twice with a different drive and a different PC and, at first, the results were suggesting it was likely faulty, giving constant speeds of 30 MB/s. I thought the cable was defective and was about to throw it away, when, merely out of inertia, I ran a third test and the speed returned to normal. I tested again the (potentially) defective cable several times and the speeds were normal.
Anyone has any idea what might be going on? I can imagine a cable being defective, but I've never heard of such a thing, a cable throttling its normal speeds and then recovering on its own out of the blue.
PS: Yes, I know a mere USB cable is worthless, and it can be easily tossed aside, but, as a matter of principle, when a piece of my equipment, no matter how insignificant, goes bad, I like to try to figure out why (that's to pre-empt advices of the sort "just replace the cable", which would miss the point).