Hi Deepak,
These are not new in UCCE set up ,First and foremost, you need to check if there was any changes in the environment...network changes, Load increased etc.Most likely caused by network issues.
I have listed few main reasons for this which i have seen in our set up .
1) Either your agent PG is running high CPU/memory .
2) Either there is a increased WAN delay between agent CTIOS --WAN- PG.
3) if Agent- PG is behind the firewall then also we have seen the abnormal latency.