[nsp] "sh run" give me "Unable to read Configuration.Try Again later" HELP!

[mac]

I all,

i'm on panic! I have a core router that is working correctly but when i 
try "sh run"  or "wr" i get:

"Unable to read Configuration. Try Again later"

I'm unable to register config changes.

I want to try to restart the router but i want to be sure that is 
software problem before that.
Otherwise  the "sh startup-config" command works correctly.

Can one give some help with his experiences?

Mac