I have a peogeut 206 with automatic gearbox, when I stick in traffic for a long time ( 1 hour or more) the gears change uncommon. they change in high revolution like 4500 or 5000 and manual mode don't work, it shows number of gear like 1, 2,.. but I can't change it. in this situation temperature gage goes up to 100 degree. what is the problem?