Actions under Modules occasionally goes blank (not loaded)

Document ID : KB000110909
Last Modified Date : 13/08/2018
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After Increasing the session timeout to 480 mins (8 hours) in web.xml  for Portal and IDM 
we noticed that occasionally the  Action under Modules goes  blank and does not load for about 5 mins.
This impacts all users including admin. 
There is another 2nd level cache that needs to be adjusted in the web.xml file,  it should be higher than the application cache time ( more than 8 hours),

add the following jvm arg to your web application start up params, -Dportal.logindata.timeout={time in millisecond} , restart application server.