Motor dead stop / restarts after 5mins

[dstick]

Hi folks,

I'm at a loss here. I have a 2000 200hp evinrude FICHT RAM injection motor that cold starts fine. It will run fine at 4000 -4500 revs for 1/2 hour but when we come back into the harbour and drop back to 2300 - 2500 revs the motor cuts out without warning ( just like a key off ).

When you go to restart, all the standard dash lights fire up, but there is no crank. Tried everything to start,wiggling key etc, checking manoverboard switch etc.

If I drop anchor and wait for 5-10mins it cranks over and fires up like there's never been an issue.

This has happened twice now. I have replaced the key switch as there is no hard or soft logs on the computer report and I can not think of what else can stop the engine while going and then not allow it to start / at least crank.

All ideas would be greatly appreciated.