Does it only happen at home. That is if you use the key and drive it away - does the fob start working at a new location?
Mine did that a year or two ago - my neighbour had the same issue on her beemer, it was just on our street. It all went back to normal after 2-3 days.
We just put it down to interference on the fob frequencies from radio, microwaves, or whatever devices - that went as quickly as it came
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