I purchased a Navigator a couple months ago and it has run great. However, recently its had several issues which all appear randomly but not at the same time: the speedometer stops working, the avg fuel mileage/miles until E goes blank with just, and recently the transmission has seemed “off”. When you put the transmission in drive and press the gas it feels like its moving forward slowly without pressing the gas (slow) and then it will pick up and run file. Today, my wife says she was driving and the rpms jumped to 6k and she couldn’t do over 20 mph. Again, all of these issues happen randomly and go away once you turn the car off and turn it back on.