What do you mean that they trip? Do you mean that the opener reverses when you try & close the door? If so, how far does the door go closed before it reverses?
You may want to check & make sure the sun isn't shining on the sensors. If it is then the opener will reverse because the sun is "blinding" the sensors & giving it false readings.
If you can give me a little more info I may be able to better answer your question.