Hi all. Wonder if anyone can help I know its not a proper Jeep lol. But my 2008 Grand Cherokee has a fault where I will be driving and the service brake assist warning comes up on dash as this happens the P R N D on the dash are all lit up as if you have selected all the gears. There is a lack of go and it doesnt want to change up gears then the lights will flicker and go back to drive and all will well again! This happen once a month ago after charging a flat battery and has not done it since until yesterday when it did it 3 times on a 10 mile journey. Any Advise grateful.