I bought my nissan pathfinder june 2012 brand new...i haven't had any issues with my vehicle until august 2, 2018 in my garage i tried to start it but it wouldn't crank. i had it towed to nissan service....i was told it shouldn't be doing this if you bought your car new...after diagnosis they told me it was my computer (ecm)so, is that normal for a 6 year old car?also, no warning signs or anything..