The NIC in the C5 hub has had issues with auto-negotiation of speed/duplex for some users' network hardware. Hubitat implemented an automatic fix for this that takes effect within 24 hours of the hub detecting it. There has also been at least one user who determined his C5 hub was generating CRC errors. This was corrected by the Hubitat team via a replacement hub. I have never heard of anyone experiencing these issues with the C3/C4 hubs.
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