Hi Zahid,
I'm not sure how about other apps now but I found some Stonestreet One recommendations for not using the revision D due to UART malfunction when higher baud rates are used. I have tested all samples at revision F we recently got from TI and everything seems to be OK. So I think changing the hardware is the solution.
Here is the thread where I found the information about rev D: http://e2e.ti.com/support/low_power_rf/f/660/p/218858/779175.aspx#779175
Regards
Matthew