OBC keeps switching to metric

[tcolburn]

E53, ‘06 3.0i
Both displays switch from US units (miles, gallons, mm/dd date format, etc.) to metric units (km, liters, dd/mm format) without any input from me. I can restore the settings but they eventually revert to metric again. In addition, the fuel mileage computer recalculates every time the ignition is turned on, and the distance counter does too. This all started a couple months ago. Vehicle has 140,000 miles on it. Don’t know if this is a failed component or maybe just a bad connection somewhere. Any ideas on what I can do to fix these issues?

Thanks!