I thought the soundaktor depended on the engine mode? If this is true then this further complicates things!
It does. When my car is set to sport or the individual engine mode is set to sport, the soundaktor is performing as expected, the steering is acting as per sport. Flitting modes after start-up is definitely changing the low end characteristics of the engine, as if my car is always driving as per the normal setting without me changing it. Have been out again this evening. The car pulls hard from 1700 rpm after changing modes rather than from 2100rpm if I leave it alone. The DTUK box negates the difference, but as it's essentially amplifying the car's normal throttle responses, the difference can still be felt.
Glad it's not just me, it sometimes does seem like some weird ECU glitch, mcmaddy's car was built just 3 weeks after mine and his behaves normally. The cold limiter is something completely different again as I can get that and the mode switch changes too. The cold protection seems to be in place until the water hits 90 or the oil hits 50 (hard to tell as the 2 temp events happen about the same time when it is not freezing.
A weird thing also happened later today, the fans came on when I parked up, they were blaring (as usual when the DPF is trying to cool) until I turned the engine off, then they settled down to a fan speed about 1/3 blaring speed. Never had variable non-ignition fan speeds before, the car has either been blaring or they've not been on at all. I'll mention the modes thing when I take my car for it's first service. I'm at about 7300 miles now, so it'll be due end July/start Aug.