Cisco 2911 Overrun

I am running a Cisco 2911 and as more people came into the new office - I am seeing input errors which are "overrun" errors. It looks like the port negotiated ok to Gig/Auto. Any thought what the issue could be?

oc-c2911-1#sho int gi 0/0
GigabitEthernet0/0 is up, line protocol is up
  Hardware is CN Gigabit Ethernet, address is 00f2.8b5a.daa8 (bia 00f2.8b5a.daa8)
  Description: PrimaryWANDesc_$ETH-LAN$ETH-SW-LAUNCH$INTF-INFO-GE 0/0$
  Internet address is xxxxxxxxx210/26
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 3/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full Duplex, 1Gbps, media type is RJ45
  output flow-control is unsupported, input flow-control is unsupported
  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: 1/75/0/56 (size/max/drops/flushes); Total output drops: 5
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 12955000 bits/sec, 1639 packets/sec
  5 minute output rate 1893000 bits/sec, 1072 packets/sec
     3103345 packets input, 3287602329 bytes, 0 no buffer
     Received 154085 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     1594 input errors, 0 CRC, 0 frame, 1594 overrun, 0 ignored
     0 watchdog, 3883 multicast, 0 pause input
     2001729 packets output, 384669985 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     2578 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     2 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out