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Have you checked that it actually working in gigabit mode, myself and a few friends had that switch and it was really bad at holding gigabit connections. It would often drop itself back into 100mbit connections for no reason.
I swapped to a cheap tplink unmanaged switch and never looked back.
You can check which mode it is in by the colour of the lights for each connection, amber for 100. green for gigabit.