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flapping interface on Gigabit

I have a router thats one interface (GigabitEthernet0/3/0) flaps a lot. A  The model of router is Cisco 2811 (revision 53.51).  When I do the sh int command the output looks fine.

#sh int GigabitEthernet0/2/0

GigabitEthernet0/2/0 is up, line protocol is up

  Hardware is PM-3387, address is 001b.d31b.6eb1 (bia 001b.d31b.6eb1)

  Description: Link to Group Router

  Internet address is

  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 1000Mb/s, link type is autonegotiation, media type is SX

  output flow-control is XON, input flow-control is XON

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:00, output 00:00:00, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 64000 bits/sec, 36 packets/sec

  5 minute output rate 82000 bits/sec, 39 packets/sec

     18421 packets input, 3800884 bytes, 0 no buffer

     Received 15 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 0 multicast, 0 pause input

     0 input packets with dribble condition detected

     19954 packets output, 4469301 bytes, 0 underruns

     0 output errors, 0 collisions, 2 interface resets

     0 unknown protocol drops

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier, 0 pause output

     0 output buffer failures, 0 output buffers swapped out

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flapping interface on Gigabit

Swap the fibre optic patch cable of both sides.

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