Garage door opens by itself - Chamberlain Powerdrive PD422D 1/2 HP Security Plus Screw Drive Garage Door Opener

You did not post the model number but you should change the code on the remotes.

My garage door opens by itself Google Search ..try this link.

Check the garage door opener itself. They may have dip switches which refers to the code set.

Remove the cover and check the drive gear. It is stripped. The part number is 41A2817 and is available at any good door opener service company. It comes with instructions.

It sounds like someone in the neighborhood has the same frequency as you do. Change your setting onyou Garage door opener and the unit itself to match, and your problem should go away.

It sounds like the default no code is still there.

Reset the unitat the opener itself and reload your code from the remote.

Maybe new keypad is shorting out from moisture or say a staple too deep into the wires?

The most common cause of this is a bad wall control or the wiring going to it. The wall control goes bad from use and the wiring sometimes has intermittent short caused by the staples the installer used.

Sounds like the Logig board is going bad in your unit.

Your garage door springs may be out of balance. Try this test: Remove power from the opener motor. Pull the red release rope so that the door is detached from the openers drive. Lift open the door by hand- it should open all the way freely. Next, pull the door back down, stopping it about chest-high. It should remain where you stopped it. IIf the door is difficult to move, or does not stay half open, the springs need replacement or adjustment.