A Forms problem ??

ok i will try to explain this problem   .......

this is the situation  :     I have  Aplication Server  10 R 2  on linux , DB 11G on Linux too,

We create the  comercial application using oracle and  reports .... and run forms application now using  at oas  jre 1.5.0.21 not jinitiator..

Now when I acces to the  forms application  wirth (oas)   in fisrt time all the forms works well ,,,  but  all the a plication can continue work well or sometimes  like  5 or 10 minutes later  (not exactly and not for time)  when acces to a form ..... it works bad.....  and this forms could be the same that in few minutes before works well