Thanks Gaurav, I will give you details as per my observations,
One more Point I need to bring in your notice is a light thud noise is coming when the wheel enters in pot holes, I checked with the mechanic and he said the shock absorvers are fine, for both front and rear, Do I need to do any of the following.
1) wheel balancing
2) wheel Alignment.
First time I took it to western Auto DIP they said Front Axle is broken, I called the Seller he, told me they are playing with me and just need to replace Lower Mounting and he suggested me to visit Cars & Bikes in Al Quoz where the owner advised me to change both gear mounting and engine mounting and also he put the missing rubber cap of front axle which I did. for few days it was running good, after a week I traveled to Oman and drive almost 1000 Kms with a average speed of 130/135 kms/per hour, after that this problem arise, However during the 5 hours journey I had taken a 30 minutes break after every 90 minutes of continuous travel.