ZenRRDCache Randomly dies - Zenoss 4.2.5

I've noticed that my graphs completely die out. When I check zenoss status, I see rrdcache has stopped. I refire RRD cache and the graphs come back with no data, after a few minutes, it dies again. When I refire rrdcache, there is a small blip of data but thats it. Then it dies again. Looking through the logs, all I can see is something that shoes me the connection is refused. But nothing as to why the service itself has died. 

/opt/zenoss/var/log/event.log shows;

2017-09-04T14:42:39 ERROR zen.RenderServer Failed to generate a graph

Traceback (most recent call last):

  File "/opt/zenoss/Products/ZenRRD/RenderServer.py", line 184, in render

    rrdtool_fn()

  File "/opt/zenoss/Products/ZenUtils/Utils.py", line 1700, in _inner

    return fn(*args,**kwargs)

  File "/opt/zenoss/Products/ZenRRD/RenderServer.py", line 183, in rrdtool_fn

    rrdtool.graph(*(gopts + list(rrd_daemon_args())))

error: Unable to connect to rrdcached: Connection refused


It's the only instance of rrdcahe in the logfiles dir. Not sure where else to look or whatever could be causing it to go stale. 

If I run the command manually, you get the following output. If I run it as the zenrrdcache start, it tells me the service is already running and it can't create the PID file. 

[zenoss@zen2 ~]$ /usr/bin/rrdcached -b /opt/zenoss/perf -p /opt/zenoss/var/rrdcached.pid -l /opt/zenoss/var/rrdcached.sock -j /opt/zenoss/var/rrd_journals

rrdcached: can't create pid file '/opt/zenoss/var/rrdcached.pid' (File exists)

rrdcached: removed stale PID file (no rrdcached on pid 24930)

rrdcached: starting normally.

[zenoss@zen2 ~]$ ps -ef | grep cache

492       2029     1  0 Sep02 ?        00:09:10 memcached -d -p 11211 -u memcached -m 64 -c 1024 -P /var/run/memcached/memcached.pid

zenoss   27047     1 16 14:42 ?        00:00:03 /usr/bin/rrdcached -b /opt/zenoss/perf -p /opt/zenoss/var/rrdcached.pid -l /opt/zenoss/var/rrdcached.sock -j /opt/zenoss/var/rrd_journals

zenoss   27079 20929  0 14:43 pts/0    00:00:00 grep cache

[zenoss@zen2 ~]$