nissan micra boot will not open , sometimes opens on its own ?

Hi , i have a nissan micra with keyless entrey , their are 2 buttons on the boot lid 1 to lock and unlock the car and 1 to open the boot . sometimes i press the button and the boot opens and sometimes it doesnt.I can be driving along and the boot open on its own, help. plus my automatic wipers come on whenever they like , its starting to drive me mad.