Hi Mohammad,
Sorry for the delayed reply. Well I could not check the phenomena in a Nokia Handset, as I do not have one at my disposal.
However I would like to add one crucial piece of information. I did a little drive test in Ericsson BSS and Motorola BSS area also.
This problem was not observed in Ericsson area. If u let me know ur e-mail id, I can also send u the logfiles.