SNMP not working properly. Timeout: No Response from localhost

Hi,

We are facing some typical issue with SNMP. we are running the below "snmpwalk" command. but sometimes it is running and sometimes it is getting Timeout error.
"snmpwalk -v 1 -c public localhost system"
We have tried the latest nety-snmp rpms.

our snmpd.conf file is very simple.
cat /etc/snmp/snmpd.conf
rocommunity public
rwcommunity public

can anyone please help in troubleshooting the issue?

Thanks & Regards,
Sanjay