Complete power loss?

Got a problem that I cant figure out here in the states. When leaving my 99 bosch p38 I lose power when I open the door. I try to turn the key and nothing. I get power back when I slam the door shut. Either door driver/passenger. Looked all around and cant find loose wires/connections. Completely loss here. Its weired cause it seems to start after I received a new key fab. Battery/alt. is putting out proper voltage. Any help is much grateful. Thanks