We have some 1760 routers running C1700-IPVOICE-M 12.3(7)XR3. They have been operation for a couple of years with no issues. In the past few months, We have started seeing High Memory Utilization from our SNMP Management Software on a couple of these. At one point, they reached a point where we could not login to them. After rebooting the routers they seem to run fine for a month or so and then alerts start again. At that point, we reboot the routers again. Not sure where to start looking to see what may be going on with these.
I have this problem too.