ISR 2811 keeps hanging

[spnlloyd]

I have an ISR 2811 that keeps hanging. The router suddenly becomes unresponsive and all the interfaces shutdown. The router can only be restored by a hard restart and the interval at which it happens keeps getting shorter. It is currently running IOS 12.4 C2800NM-ADVIPSERVICESK9-M. Someone please help.

[spnlloyd]

I read another forum and they proposed and IOS upgrade. I shall do this upgrade and update on the status afterwards.

[Joseph W. Doherty]

Do you have a static default route to the an interface rather than an IP?

What particular 12.4 release?