There is a big electrical connector in the left kick panel or firewall. Water is getting in and shorting the wiring. The water intrusion needs to be found and fixed. The connector and contacts may need to be cleaned.
It won’t take expensive parts to fix but it will take significant labor and a mechanic willing to work under the dash to fix it.
If you don’t fix it, the corrision the leak causes will eventually cause the problem all the time.