Friends, after doing the following yesterday I got rid of screen freezing problem. Please give a try though I don't know the logic behind it.
I Enabled Developer Options by
Settings-system-advanced-about phone-kept on tapping 'build no' until it enabled
I switched on 'show taps'
Settings-system-advanced-developer options- show taps
From this point I did not face any issue of freezing. After few hours I reverted back to normal by switching off developer options. There are no freezing issues till now. Please give a try.