First point was related to how I can check from somewhere like server log that how these files got deleted.
Second point was the another issue that I am facing, when i try to install plugin using upload file, I am not able to install the plugin
Third issue is that again I am facing the same issue, everything was working fine till the time I got the 500 interval server error, this time I took the screenshot, this is what happened earlier as well and then some file got deleted.
After your suggestion from the wordpress itself I re installed the wordpress after which some of the features started working like map suggestions, social import or all cant say, but still when I publish after preview it gives the same attached error message and not allowing to publish the listing and all feature again stopped working.
I need to understand what is the issue and why this happening.