Inserting new cables while the unit is on sometimes causes odd behavior on the port and equipment requiring a power-cycle — this only seems to be an issue for 100 Mbps connections, so it may be part of the 1000 / 100 /10 auto-negotiation. Once power cycled, I’ve had no additional problems.
$49.99
($24.99 after $25.00 Mail-In
Rebate 
)