prabhatsoni,
It seems lots of people are having the same or similar problem as you.
This Google search got 94 matches. You might want to, in particular, take a look at
this fedoraforum thread.
This post talks about the need to update to the most recent version of
autofs, while
this post talks about updating to an even newer version of the kernel. However, the next post reported even that did not solve somebody's problem. There might be more than one issue here, but I would suggest following development on the Internet to see what you can find.
Good luck.
@ramesh6056,
The fact the this functionality still works on an old kernel suggests that it is not an issue with the configuration files.
EDIT: minor wording change for clarity