I used to have a 97 Cherokee. At one time, it had issues with the 4 way flashers turning on with the turn signals. This was a long time ago, so bear with me. But as I recall, the issue had to do with the multifunction switch having an issue. I'm about 80 percent sure we solved the problem by changing the multifunction switch.
As for the door looks, check the wires in the doors. Jeep used cheap wiring that has a tendency to wear the insulation out from opening and closing the doors. Eventually the wires could also break. This caused issues with the speakers, power windows, and power locks. If one of those wires is grounding out, that could be your door lock issue. To troubleshoot this, I'd try unplugging each front power door lock switch until the lock problem stops.
Also, if it has remote keyless entry, it's possible that could be having an issue.