my site (ASP.NET webForm ) log out with out user request -

my site (asp.net webform ) log out out user request , user forced login page , interrupt work ? please advice ... line web.config

 <authentication mode="forms">       <forms loginurl="~/account/xxxxxxx.aspx" timeout="2880" />     </authentication> 

try increasing session timeout value, default 30 minutes.

<system.web>     <authentication mode="forms">           <forms loginurl="~/account/xxxxxxx.aspx" timeout="2880"/>     </authentication>      <sessionstate timeout="3000"  /> </system.web>