yeah earlier 1st generation triptronic by mitsu called INVECS/INVECS-I had few problems e.g. grear changing automatically and not to high revs or droping gears at low revs, and alot of other transmission problems.
but the INVECS-II is simply supurb
its like driving a manual
but guess what it works with your ECU
and learns from your drivign style
so even in fully auto modem if you change gear at higher rev it will learn and do it for you
all you have to do is to dissconenct battery to clear the ECU memory of you old driving style.