Gaps in graphs since switch to SNMPV3

[aej74]

Ever since we switched to SNMPV3 gaps have started appearing in all graphs simultaneously at random intervals. Below are the details on our setup. Any assistance on this would be greatly appreciated.

TECH INFO
------------------------------------
Date Wed, 21 Jan 2015 11:41:29 -0800
Cacti Version 0.8.8a
Cacti OS unix (Ubuntu server 12.04 LTS)
SNMP Version NET-SNMP version: 5.4.3
RRDTool Version RRDTool 1.4.x
Hosts 67
Graphs 95
Data Sources SNMP Query: 105
Total: 105

Poller Information
Interval 60
Type SPINE 0.8.7i Copyright 2002-2011 by The Cacti Group
Items Action[0]: 206
Total: 206
Concurrent Processes 16
Max Threads 15
PHP Servers 10
Script Timeout 25
Max OID 100
Last Run Statistics Time:1.5385 Method:spine Processes:16 Threads:15 Hosts:68 HostsPerProcess:5 DataSources:206 RRDsProcessed:103

PHP Information
PHP Version 5.3.10-1ubuntu3.15
PHP OS Linux
PHP uname Linux cacti 3.13.0-40-generic #69~precise1-Ubuntu SMP Fri Nov 14 10:29:31 UTC 2014 x86_64
PHP SNMP Installed
max_execution_time 30
memory_limit 128M

Hardware: HP ProLiant DL120 G7 (658417-S01)
Processor Information
Version: Intel(R) Xeon(R) CPU E31270 @ 3.40GHz
Voltage: 1.4 V
Core Count: 4
Core Enabled: 4
Thread Count: 8
Characteristics: 64-bit capable