After running about 70-80 transactions QTP and the browser hangs and stops running.

[pram]

Hello Ankur,
As per your suggestion i checked Ram of the machine on which i am running this test.
Staus of RAM as following

Before Running the test
-----------------------
Physical Memory(k)
Total 775280
Available 427988
System Cache 407436



During Running the test
-----------------------
Physical Memory(k)
Total 775280
Available 337668
System Cache 352344


After Running the test ( when browser hangs)
--------------------------------------------
Physical Memory(k)
Total 775280
Available 307360
System Cache 353588


so i think seeing this i was not problem of memory ( still available memory is there )
what other factor cause this problem?
your help will be appreciated.