Radio presets slowly disappearing?

[bfeng]

I did a quick search and didn’t see this topic discussed before.

Over the last week my 17 radio presets are slowly disappearing.
A few days ago 12-17 were gone.
This morning only 1-4 show up.

Anyone else experience this, and if so did you find a cause/fix?

FWIW, my battery is 11 Years old, and yet it tested out healthy 9 months ago when I brought it to my local auto parts store. The battery in our ML350 is 8 years old and it also tested out perfect. I can’t explain why these have lasted this long.

Other than this my 2011 x5d is running great.
At 130k miles I had front and rear control arms replaced and changed shocks to Bilsteins, and it drives almost like it did when new. Control arms seem to be good for about 60-70k before they wear out. Upkeep has been expensive (averaging $2000 a year in repairs after going out of warranty), but everything on this e70 works as it should (including the entire emissions system). Seems
Like this SAV will easily get to 200k miles.