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While you encounter the "Drive Mode Disappearing" issue, please turn on your AC and look if the AC display icons at the bottom of the screen also vanish.
If this is the case, then it is indeed a known issue. I understand that it is a FW update. No need to replace any hardware (I.e. Radio / Related modules). There is a TSB regarding this issue and there it reads that GM is still working on a fix. This was a couple of months back.
One way of avoiding this situation, worked fine for me for quite a couple of months (syndrome did not re-occur), is to unlock both driver and passenger doors (press the driver's door handle button twice) and then re-lock and then unlock again.
Probably some power management quirk that is solved by re-activating certain circuits when doing the above process.
Obviously, this is just a temporary fix until GM comes up with a real solution.
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