Before replacing old hardware.
A repair, a compatible replacement and a conversion can have different effects on an existing door.
Read the lock repair explanationTHE PRACTICAL NOTEBOOK
USEFUL SERVICE READING PHYSICAL KEY ACCESS
A little closer to the problem.
Useful reading for the part you noticed. These notes help explain a request without asking you to name a failed component.
GARAGE CONTROLS
When the garage door opens by itself.
An immediate reversal and an opening much later are different observations. Keep the sequence, recent control changes and the equipment model with the request.
Read the guideA new key arrangement.
Sound hardware may stay when a suitable cylinder is rekeyed. Keep included and unchanged doors clear.
Read about rekeying