Web Site Log Out in Mozilla Firefox on Post back

Question

Hi to all,

 

I am having live web application, which some times log out due to post back in firefox only.

At that time Session become null and Log Out.

 

In Other browsers working fine. I am using Firefox 69.0.2 (Latest) version.

 

Log Out happnes into Live Clients or in Production server only. In developement system working fine.

I am having Old Web Application around 12 years old web site (Product) and successfully using 150+ clients.

 

Some clients facing this issue. I have checked at my end. Issue still persist in some pages of web site.

Any one faced same issue?

 

Is there any thing that i can check that issue in otherway ?

 

Thank You