[quote user="sai surya teja"]
400mA regulator is mentioned in
[/quote]
Ok, so if what I understood is you never measured current and that is max regulator current, otherwise USB at that rate tend to shut down, try open usb diag and see current drain from receptacle, I suppose is in the range of tens of mAmp.
[quote user="sai surya teja"]Hot = temperature > 50 C (approx)[/quote]
Which processor, JTAG controller or Target? Again both processor after a while on are both at Tamb. How did you measured temperature?
Is the room where you are using wet? Are you wearing right clothes? Are they of cotton and shoe antistatic too? Otherwise may be you damaged some port by static discharge.