2009 Automatic... No Crank... No Start

[Thymeclock]

Well I have tried replacing the starter relay... no joy
Cleaned battery terminals and pulled and reseated fuses and relay in the fuse box under the hood... no joy
today I cleaned the grounds on the engine block on the drivers side of the valve cover and pulled the bolts for the grounds behind the headlights and cleaned them up... now we will see?
Does anyone think it might be the ECM/ECU? it is fairly accessible, but is there any special setup or programming involved with swapping one? I can e-bay an ECM for around $50 it is an easy change, but I have run into vehicle specific issues before with computers.
Thanks for the help!

When you say "no joy", does that mean it won't crank at all any more?

When you say "now we will see?" does that mean it does crank all of the time now, recently?

I still favor the idea of whacking the starter with a hammer if it doesn't crank. Have someone turn the key while you whack it. That usually reveals the problem.

[jnadenicek]

Well, no joy means no change in the issue...
it is very random, for example, I have taken to following the wife around before she tries to start the vehicle. Yesterday, all worked fine, today she went out to start it and no crank, the display in the dash went off when she turned the key like normal and the radio muted like normal but no crank. I had her open the hood and then before I could do anything under there it cranked and started, I am sure I could quit guessing and fix it if it stayed broke long enough to check a few things. Today I ran a new bonding ground from that lug on the side on the valve cover to the ground behind the drivers headlight, "now... we will see?" again!!!
I have had ECM/ECU modules do stuff like this to me before (in my Plymouth NEON) but I can't help but feel this is a simple bad connection issue, intermittent wiring issues can be very elusive to locate!!
Any new insight?
Thanks