Hi Scott - this doesn’t sound normal.
I know that there is an issue/software flaw where the system will default to French every now and again but should always be saving the profile settings. Is it a brand new DS7 or second hand?
I will add that I am on my second DS7, as the orginial one I purchased was a flawed one (can see the previous post here - How this forum saved us from a dodgy ds7 - #6 by Derby - where due to hidden accident damage the car would not remember any settings when profiles saved.
Definitely worth pursuing with DS/Main dealer as doesn’t seem right