2960x broken when USB console cable connected

Hi
I have a strage issue here, on 2 different  2960X  (  WS-C2960X-48TD-L ) when I connect the mini USB cable for console access the switch do not respond anymore, after few seconds all the led stop to flash, the switch start to broadcast all packets on all ports, causing redundand port to create a loop.
The issue is present on both switches, tried to cold boot, tried updating to 15.0(2)EX4   but still same issue.
I tried different usb cables that are working on 2960S and 3750x, anyone with this issue ?
It is annoing as I have only usb pors available there.
The issue start when the cable is plugged in without even start the login, the Control plane free about 20-30 seconds after. If I remove the usb cable everithing is fine again, but spanning tree on other switches has gone crazy due to the switch was farwarding on all ports.

Hi,
anyone has this same issue ?

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