RTMT Virtual Memory Usage not showing in graph for Subscriber

[travlmoore]

I noticed today that there is no graphical information being populated in RTMT for one of our CUCM subscribers.  Everything is working operationally from what I can tell but wanted to see if anyone else had experienced an issue like this?  

I have attached a screen shot of the Memory and CPU utilization.  This subscriber should be populating a red line close to where the other subscribers yellow line is.  I have also attached the memory utilization statistics for the subscriber.

Thank You

[George Thomas]

i see this at times and it fixes itself when you restart RTMT provided you dont get any AMC error or server unreachable errors when you log into RTMT.