That happened to my car, upon investigation I found that the pressure switch underneath the car had a loose wire, almost off and would cause it to flicker.
Whilst talking about the dashboard lights, I did the following modification.
The blinkers worked a blue light on dash and with the hood down most of the time, I had no indication of when the blinker was left inadvertently left on. Could not see the light at all...
I removed the blue light and the orange light (handbrake warning ) and switched them around.
The result is that I can now clearly see the flashing orange light and I will try to find another colour to replace the blue warning, maybe a clear one.