AC related power outage (partial)? HVAC?
I'm going to slightly disagree with the other answers and guess you have an open hot conductor.  Either way, the answer is the same: call the power company and report a power outage. The problem is very likely at the pole, so they'll come out and fix it for free.
For more information on why losing one of your hot conductors will cause the symptoms you're seeing here, take a look at Harper's answer to this similar question: https://diy.stackexchange.com/a/153926/91556