lupo cntral locking prob
 

hi,can anyone help or advise?.
got a
VW LUPO 1.4S 16V T REG,ENG AHW
got a nightmare of a prob with central locking etc,turn key in door lock,buttons go up n down,feel intermitent resistance against the key while in the lock,then when in the car and start up to drive off sometimes buttons go up and down on there own.also elec windows dont always work,not sure if its all conected to the same prob??.
car has central locking that when you hold the key turned to lock and the windows are down it will automaticaly close them if you know what i mean.
just wondering if anyone had same prob and what parts i need to be changing?.
thanks a lot