I need help a shop is no help!

I have a 2014 Caravan with a list of troubles. Yet the shop says there are no codes and can not spot anything broken. This is my wheelchair van so I need it daily. I will take any help I can get. Below is a list of what's going on. It all started after a alternator went bad. Any help will be appreciated.

1When you go to start it it may work the first time or you may have wait a minute and try again until it starts.

2 When driving it will randomly shut off. It does not matter if you are on the throttle or not.

3 The traction control will beeper will sound and come on the screen. It will happen if you are in park or driving.

4 The ac and heater fan speed will change depending on if you are on the throttle.

5 The dash lights will blink at night.

6 After shutting off or not starting the clock resets like it has lost the power from the battery,

7 The power side doors will randomly not work.

8 The fuel gauge does not work. Each time you start it it will show different levels. I tends to stay on empty.