The two issues could be related if there is a problem with the logic, or control, board but the light shutting off is probably just a timer that needs adjusting or a feature that needs to be turned back on. Depending on which model you have the procedures to address that vary but your manual will have full details. If you want to view your manual online at Manage My Home just follow the directions in the link below.
Safety sensors that do not work are a much more serious issue. The safety sensors are a very important safety feature developed and made mandatory by law because even a small door and opener can cause a lot of damage or serious injuries or even a fatality if accidentally closed at the wrong time.
There are some basics on how the safety sensors work and how to troubleshoot them in the links below. If the information there does not address the issue you may want to consult a professional to be sure your door is operating safely.