I just had this happen TWICE this weekend, after about 90 minutes of highway driving.
Dealer didn't know anything about flashing gear indicator but the car jumping to N is when the TCU detects low hydraulic pressure and it shifts to N so you can stop, assuming it might not have enough pressure to hold the clutch in.
I assume it is all related. It flashes to let you know things are going south and then pops you out of gear.
Car upshifted with paddles, but went straight from 4th into 6th, with gear indicator flashing.
Mine did this too.
In my car I couldn't get 5th or 6th this weekend, and shifting is a lot slower.
I recorded it on video the 2nd time it did it. Previous times (this is about the 4th or 5th time now) I couldn't get it into 4th or above and had to drive home in 3rd....!!!!!
What is STUPID is no CC light or error code logged. What crappy engineering.
Car is at dealer --- they've tried to diagnose this problem twice before and updated software and tested pump current draw at 18500 service a few weeks ago and pump looked ok.
It is clearly a pump overheating problem (also my voltage gauge was down near the mark above 10v when I was sitting in traffic, no charge light so alternator is ok).
Service manager says the pumps usually take out the fuse/relay when they go, and this is just must be a new failure mode he hasn't seen (pump takes a dump after 90 minutes of highway use).
So they're replacing the pump (thankfully).
My advice to you is to tell them you're not taking the car back until they fix the problem and that it is a safety* related defect - I could have already justified a lemon claim with the number of shots they've had at mine. (to be fair they're hampered by the fact it doesn't log an error when it happens)
(*I know I'm not crazy about losing drive while doing 80 around a curve on the highway in the wet. grrrrr.)
Q: How many miles on yours? I'm at 18,000 or so.