You'll find other posts on this forum about the remote portion of the key stop working, another one recently for the Fobik type key. So, I guess it happens, but it doesn't seem to be common.
Again, follow the advice about checking another battery, a new battery doesn't necessarily mean a good one, you've always could have put it in backwards. The button cells sometimes sits on store shelves for years.
Other vehicles, without transponder or rfid chip keys, the vehicle usually has a procedure to program the remotes to the car. Sometimes if a remote lost its programming to the car, you could go through the procedure to reprogram existing remotes to it again, like if you got a new remote.
But since the Commander only comes with XPDR or RFID chip keys, the programming the xpdr/rfid to the car also does the remote at the same time.
Besides, if the remote was working intermittently, that is NOT a programming problem, it either looses the programming until it is redone or doesn't, it doesn't loose it and reprogram itself, do it all over again, intermittently. So I suspect something physical caused it to fail.
The keys go through a lot, even though they are tough, it just takes some goo or something rubbing off your fingers to ooze in and it can short out the buttons or damage the circuit board.
One thing I have had luck with, is the cleaning the button themselves, the rubber skin, if you can take it apart and separate the rubber skin buttons (most remotes I've seen, you can) and clean it, the back especially that has the carbon impregnated pads that press on the contacts of the circuit board. Soapy water for the rubber skin, let it dry, then clean it with something like windex or electrical cleaner. If you have the batter out, you can clean the circuit board with windex, or electrical cleaner with battery in. That might get it working again.
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