I have not seen this in years. Many years ago I had the same problem, which led to more then 1 argument with my wife about leaving the garage door open, until it happened one day when I was standing in front of the house! It turned out the channel 69 TV (old analog system) was on the same frequency as my garage door system, and at random intervals, the signal duplicated the DIGITAL code and the garage door opened.
With the new versions of the garage door openers, this should not be a problem. Do you have an outdoor keypad? If so check the wiring to make sure there are no bare wires, etc. Also, on the outside chance that one of your neighbors has the same code, you should be able to change the code on your system.
Did you program your car to open the garage door if so, was your car locked?
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