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LMR16030: While Controlling Enable PIn device not able to deliver load current

Part Number: LMR16030

Hi,

   We are using LMR16030 Enable Pin for Under voltage Lockout / Cutoff. We made it ON @ 12.7V and OFF @ 12V, without load ON and OFF are working fine(not accurate and working ON and OFF @ +/- 300mV Error). 

Power supply Specifications:-

Input : 8 -32V DC

Output Voltage : 4V7

Output Current : 2A

Enable Pin Voltage divider Value : High side - 133K and Low side - 14.3K.

Issues i am facing : 

Conditions - 1: Increasing the voltage from 0 to 12.8 its working fine.

Conditions - 2: If i reduce the voltage below 12.7, output voltage of LMR16030 slowly reducing from 4V7 to 3V5. Output of Power supply connected to GSM module and GSM module demand 2A during the network registration and sending data through GPRS. I this condition Powersupply could not able to deliver 2A current due this GSM module restarting.

Can you pls any one suggest the solution to overcome this issue. Power supply Schematic enclosed for ready reference.