TRUCKS STUCK IN FIRST GEAR - XBOX

Hi Guys, we have just had the November 2025 update and my Snowrunner on Xbox experience has turned to custard. The trucks are noticeably slower and less powerful. There is also an issue where they will shift out of first to second or third only to immediately jump back into first. Tapping the clutch will force the shift, but it drops straight back into first again. I use the Mastadon as my go-to truck and that won't even pull an empty trailer through mud any more, even when specced with best motor. I have reinstalled the game and it had no effect. It is bad enough that I will stop playing this game I love. Any ideas?