Used to have the same problem when i had my corolla. Most important you can do is make sure that @#$!(*& ground cable is grounded to bare metal and that's tight and doesn't jiggle or some lose. Make sure you have 10 or 8 guage power and ground cable. And if your terminals are lose tighten or try to re-soilder if you know how. When wires are lose thigns stop working when the car is in motion !!
.