on cisco router 2921 ip routes missing?

Dear Expert,

I am facing problem that on my router cisco 2921 "ip routes are missing" and IPsec VPN is running on that router. it was working fine since last 6 months, suddenly I start facing problem since last 3 days?
CiscoR# sh ip route
Default gateway is not set

ICMP redirect cache is empty

and If i enter command "ip routing" and again I have to enter my all static routes then it start working but after sometimes I face same problem again.
NOTE: no router shutdwon/restart or anyother changes, this problem is coming automatically.
please help.
Who is Participating?
nainasipraConnect With a Mentor Author Commented:
I have changed IOS now its working fine :)
Justin YeungSenior Systems EngineerCommented:
well did you write mem?

do show version and see what is the actual up time.
nainasipraAuthor Commented:
hi Yeung,

sure I did write mem always and uptime is also long time mean it was not restarted/reload.
Don JohnstonInstructorCommented:
The first thing I would do is look at the logs and see if there are any message that coincide with when the problem occurs.  For example, you may see an interface that reset or the config changed at the time when you lost the routes.
nainasipraAuthor Commented:
IOS upgrad solve the issue
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