I have astra MK4, 1.6 petrol, 2000 model

My car's Engine warning light started to come, after connecting it to the computer it was noticed that EGR valve is having issues..

I replaced the EGR valve with a brand new one and after sometime the engine managment light again comes on and goes off

On connecting the computer the fault codes changes from:
EGR VALVE - PRESENT
to
EGR VALVE - INTERMITTENT

Please advice