hi
check engine compartment fuse and relay box.my preview post that I fixed it by changing relay works only for few thousand miles.It was not the relay what cause the problem,but the wiring.
You have to open the fuse box to see the wiring under and check wire connector feeding ECU relay.It is permanent power from the battery ....thick red wire....with connector connected to aluminum rail .This connector is probably loose .Best way is solder it on the rail.This problem is undetectable by diagnostic,because everything works fine until ECU lost the power for milliseconds .Bad engineering I would say.
Don't be fooled by the fact that the connector looks good..... like me!

 

Jardus helped me with my problem, scroll up and you will see his response. Switching the relay fuse from a 40 amp to a 70 seemed to do the trick.

Melody Reels

 

hi Melody
If it is starts doing again,check my last responce.There was problem with wiring under relays.
Jardus