I have no solution, just a story what happened to me last week.

The infrared key did not unlock but changed the red blinking sign in the mirror to green. So I unlocked manually and drove the car. Later this day, the remote locking was back to normal.

Next day when I was turning the key, the starter didnīt crank. The mirror lamps were going red-green-red-green. Did check for fuses and tried neutral and was afraid the starter was gone. Left the car for two days and then all was working as normal again!

After one week of back to normal, I donīt really know what happened, but it seems to be too much electronics in our cars.... (This was my G500)

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-94 E 36 AMG Coupé, Brilliant Silver
-98 G 500, Obsidian Black
-05 Mini Cooper, Solid Black
-97 993 Carrera S, Ocean Blue