After running any OOB, QBR or custom BIRT report, user gets logged off automatically. It's very frustrating.
Solution is to check the System Property: mxe.report.birt.viewerurl
When you have clustered environment or you run BIRT reports on a dedicated server, you set the value of this property to that server address. However, if you don't have this kind of set up and you set this property to the address same as your Maximo URL address, you will face this issue.
My environment was not clustered so I removed this value and kept it blank and the issue was gone.