bmwtye

So there is no pattern at all to this but this is whats happening. When I try to pop the hood from the key, sometimes it does, sometimes it doesnt. If it doesnt I then use the button inside and sometimes that does it, sometimes it doesnt. If that doesnt work, if I start the car and push the button inside that usually will pop it. However, there are also times where not even that works. Sometimes after driving a while, same issue, cant get it to pop either. All the times that it isnt popping, I can hear the mechanism working to try and pop it. Does this sound like a bad solenoid, or is it something else?