Solved: Non-wired doorbell

Can someone please advise. I have had to get rid of my doorbell/push. Although it worked when push was activated, it also activated itself of its own accord. It would ring out and when i reached the door, there was no one there. This sometimes ocurred in the middle of the night which was a bit unsettling. Can anyone tell me why this was happening and how to avoid the problem when I get a replacement.
Thanks

 

I had one of those wireless doorbells and mine did the same thing. . . drove me nuts, I finally changed the battery in the pushbutton (12v battery) and it stopped. . . maybe it works like a smoke detector telling you the battery is getting low?

 

The remote control on my car keys activated the wireless door bell on a friend's house!

 

Thank you for your replies. The one about changing the battery in the door push sounds the most logical. I'm going to buy a new one, so we shall see.