I have owned my 2015 Spark EV for a year and a half now, and I love the car. However within the last two months something unusual has been happening. The instrument panel illumination will randomly turn off, and stay off for 10 to 20 minutes and then turn back on. I know that the panel illumination is supposed to go off when the windshield wipers, heater, or air conditioner are on, but this is just at random times when none of these are in use. It is quite annoying to say the least,. When the sun is shining I cant even even read the speedometer or remaining battery charge. Has anyone else had this problem? As far as I can tell, nothing happens to cause the light to go off such as hitting a large bump or any thing else. Any ideas or recommendations?