Ip: discarded ; Udp: errors

When I run "netstat -s", I see that counters for "incoming packets
discarded" under IP and "packet receive errors" under UPD incrementing. I
have correlated this to an application crashing. The app uses UDP.

netstat -s|egrep 'Ip:|Udp:|disca|error'
Ip:
99792 incoming packets discarded
Udp:
99792 packet receive errors

I am not seeing interface errors on the systems or switch.

How can I determine why packets are being discarded?

Thanks,
Joe