Exterior dusk/dawn sensing lights all stopped at once

I bought my house in 2018. It was built in 1992 and has 2 sets of exterior lights, one set in the front yard and one in the back yard. Each set is controlled by a switch inside the house. Each switch is part of a box with 2 single-throw switches. The other switch in each box controls an interior light; both interior lights work fine. When the exterior lights worked, if the switch was thrown and it was past dusk, the exterior lights would be on. If the switch was not thrown OR it was...

Exterior dusk/dawn sensing lights all stopped at once