Saw two crafts appearing then disappearing and moving back and forth

My partner, my mother in law and I were headed south on the 101 Freeway to go to a family wedding in Gilbert. My partner, who was driving, noticed two disc shaped metallic crafts moving back and forth quickly and disappearing and then reappearing. My Mother in law and I spotted them too. I then took my phone out to record them. They eventually disappeared and we lost track of them so aren’t sure if they reappeared. These were not aircraft, as they would quickly move right and then to the left and back and forth. The sky seemed a bit hazy, though it was sunny. We have no explanation but wanted to share the sighting.