chech trans

[7 Decades]

Went for a ride today after about 100 mi stopped at a shop for 1 hr. when i started the check trans flashed and would not go in gear.
I turned it off and started it 2 or 3 times and it was ok .this is not the first time this happen. the last time i had dealer look at he said he could not any thing . 2010 rsse5. I checked oil is ok.Thank You .

[Freddy]

Here's the problem - se5