I recently have been experiencing a lot of issues surrounding key memory. My clock would go out of sync, my radio station wouldn't save, and most annoyingly my welcome lights and follow me home lights stopped working.

Turns out it was a little extra connector that connects to the IBS module, mine was disconnected. The IBS module sits on the negative terminal of your battery reads the car voltage and sends signals to the various computers to turn them off if it deems there is not enough power. Turns out, the little wire is the voltage read wire and when disconnected, it puts modules to sleep when the car is off.

The mechanic must have forgotten to re-connect it after pulling the engine out.

Anyway, long story short. If you're having strange electrical issues, check that your IBS module (connected to the negative terminal of the battery) has all the connectors in place. I know electrical issues can be many things, but I thought I would share something simple, just in-case it helps someone, someday.