3-4 shift on light throttle went to neutral

[askoncemore]

During light city driving my Flex attempted to go into fourth gear and just reved.
I let off the gas and it calmly went into gear. 
This happened 3 times... a bit concerned.

I disconnected the +battery post and grounded it over night to reset comuter.
Has not happened again but the shifts are a little harsh on light throttle.

Any ideas on what is happening?

 

[SHOdded]

No codes?  When was the last time you changed spark plugs/transmission fluid etc.?  Datalogged recently?

 

[askoncemore]

No codes, plugs 5k ago, drain and fill trans 8k ago.

Nothing strange in the datalogs that I can see.

Do you have anything to look for other than line pressure?