Hello Jess,
Thank you so much for your guidance. Windchill Version is 9.1 M050 and Server is running on the Java Version 7 Update 51 (build 1.7.0_51-b13).
I would like to ask few more questions, Does this happen due to heavy load on server or the incompatibility of the version?
Because sometimes when I clean the cache memory & restart the server then system works properly. But this issue did not get resolved even after clearing cache.
Regards,
Tanvi.