Call Volvo on their 800 number and ask for a book with all of the codes, it does exist and might cost you $25.
As for your problem, your key has a chip imbedded in it and it may be failing. Make sure your key chain doesn't contain a magnet. The next time that happens, just pull your key out and put it back in again.
Your wife's key is probably in better shape.
You do not need to get out of the car to lock it and set the alarm. Just make sure the key is out when you lock/unlock using the keyfob.
Klaus
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(V♂LV♂s 1975 164, 1995 854T, 1998 V70R)
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