For the blinker issue. I would assume 2018 vehicles to be LED lights. that means they are direct current circuits only. Older style lights can backflow current through the system but LED's cannot, as they usually contain a voltage limiting, blocking diode (zener). This is to prevent spike damage to the LED lighting modules when you let go of the power window switch for instance...
Check your ground circuit for the dash lights and the module. You will probably need a wiring diagram to understand where they terminate. I would have someone outside the vehicle confirm that when the lights hyper blink inside they are not doing the same outside as well.
If the grounds are good, check the fuse for that circuit and verify its in good working order and properly seated.
If all that passes and the lights still hyper blink (randomly), I would suspect a defective blinder module.