Help
 

So my 2009 Mazda 6 has been having some issues the dashboard lights light up like the cars off when the car is running and I'm driving and then also my welcome center keeps turning itself on and off while I'm driving and then when I go to stop and try to turn my car off if my welcome center is off the car won't turn off then when I finally get the car to turn off sometimes the car won't start when I push the button to start it and nothing happens at all there's no power anyting then I take the battery wire and jiggle it and my car starts I've tested the battery and I've tested the alternator everything seemed fine does anyone know what's wrong?

Sounds like poor connections. I would suggest taking it to a Auto electrician.