Yup.... Send Hyundai a letter by certified mail, return receipt requested
explaining exactly what you did here. Stress that it's been in the shop four
times. Don't take it back until they contact you. Assuming you are in the
US, you are pretty much to the point of having the vehicle replaced. Read up
on the lemon law in your state.

The next try should be the last try at repairing it.

Since one or more solenoids were replaced, I'm guessing it's setting
solenoid electrical code.  In that event, I'm curious whether they'v
replaced the appropriate solenoid, whether they've verified proper ground
and whether they replaced the engine/trans control harness or whether the
replaced the internal transmission harness.

Since you shut the vehicle off and it seems okay afterward, it's somewha
clear we're dealing with an intermittent issue that only happens for
short period of time, making it difficult for normal diagnostic procedure
to pinpoint the problem (because everything will test normally at the tim
of diagnosis).  

Contact the dealer for repair.  It's about all you can do.  If you'd lik
to guarantee extra attention, you can also call Hyundai consumer affairs
but it's likely that if you're now on your fourth visit for the sam
concern, Hyundai is already well aware of your issues.  If you'r
interested in buyback, check the book you received with the vehicl
regarding the procedures in your state

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