2001 Hyundai Sonata tries to start by itself, have a new battery and alternator. Drained my new battery. What could be the problem?

What is your question?

Problem first started driving down the road, lights and gauges started going crazy. Replaced the alternator, couple days later it started again, replaced the battery, few days later I'm outside and hear the car trying to start itself, with nobody in it, no key in it. It must have been doing this for a while, drained my new battery. What could be the problem? I'm thinking ignition switch?

How long has your 2001 Hyundai Sonata had this problem?

2 months