Re: Well that was an invisible problem
When the ethernet was invented at Xerox they had about 100 ALTO machines on one RG11U foam 3MBit coax. They set up a test by having all of the machines transfer data up to 9000% of the cable's capacity. Things slowed down (of course) but there were few lost packets because of the collision detect and retransmit algorithms in the machines. ALTOs were not capable of sending or receiving back-to-back packets so would miss consecutive back-to-back packets sent to the same machine.
Another test revelled that about .01% of the packets were received corrupted and this was traced to a synchronizer timing error in the ethernet tranceivers. When this was corrected the error rate went down to less than 1 in a million.
Sounds like a router/switch problem.