The first thing I would do is inspect the harness connecter. There are 2 connecters exiting the column . The one from signal switch has smaller wires.
Copper is an exellent heat conducter so if the ignition switch is heating up its connecter should get warm too. I've seen those connecters melted so bad that the switch side has to be destroyed to get the 2 apart. Lets hope the cars harness side isn't damaged beyong reuse.
That igntion switch isn't as hard to replace as it is just annoying. They used 73736 different types of hardware in there so half the tool box is required. LOL
I must repeat a warning about aftermarket switches out there. Many of them have a extra (WRONG) wire in them. Hook it up directly from the package and you'll blow the dash light fuse.