Doing a dive today. 20 minutes in length. Never went below 40 feet.
MK2i set for single gas, air. (21%)
When I surfaced, my MK2i starts alerting, giving me the following message:
"PO2 is low. Descend or switch to higher O2 gas."
This is a bug, right? Why would I get a low PO2 alert on the surface?
Two more dives today. Same thing.
PO2 alert going off as I hit the surface, telling me to descend or switch to higher O2 gas.
Going to see if I can reset my Mk2i back to factory settings and maybe it…
I think I might know what's going on. All four of these dives were done at high altitude (over 6000 feet.)
I wonder if it's possible that this is what triggered the low PO2 alarm when I surfaced.…
Also I would still say this is a bug as a low po2 warning shouldn't happen when surfacing, but not one to worry about. Guessing the code is using the literal po2 all the time rather than in dive po2.…
That makes sense! Thanks for the detailed info. I figured diving nitrox will help. Fingers crossed we can see a fix soon. This ain’t a cheap DC 
