Keyless entry 200

Has anyone else had this problem?

When its cold or my keys have been in something even the slightest bit damp the car door just does not open at all, few times now i've had to take the key out and clamber in through the pass door! It takes about 6-10 pulls of the door handle to finally get it to open? Is this fixable through renault warrenty? Surely it should be? Its getting annoying now!