Recently installed motion detector light won't stay on?

I recently installed a motion detector light in my garage so that I don't have to fumble in the dark for the switch. It is a basic, inexpensive light with two screw in bulbs. Initially, it worked great. I set it to stay on for 5 minutes, and it worked flawlessly for about a week. Then, it started having a problem where it would detect motion but only stay on for a few seconds. It detects motion perfectly but won't keep the light on for any amount of time. I'm go through all the settings and it doesn't fix the problem. I thought the LED bulbs might be the issue, but its the same with incandescent bulbs also. I'm thinking I got a faulty unit at this point.

Is there anything else I should try before uninstalling it and exchanging it?