rx_soft_overflow_err on FastEthernet interfaces

I am seeing input errors on a Fast Ethernet interface on my 3725 router running IOS version 12.3(17a):

100204623 packets input, 1244960943 bytes Received 2913690 broadcasts, 0 runts, 0 giants, 0 throttles 33006 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog

I am also seeing the "rx_soft_overflow_err" driver counter increase on the same Fast Ethernet interface:

Number of Transmitter Hang = 0 tx_more_col_err= 0 tx_one_col_err= 0 tx_exc_collision_err= 0 tx_late_collision_err= 0 tx_underrun_err= 0 tx_error_intr= 0 rx_soft_overflow_err= 39622 rx_overflow_err= 0

I believe the two problems are related, but I am not sure of the best way to go about troubleshooting the problem. Can anyone provide insight into what the problem may be and how to correct it?

Thanks.

V/