I've had the occasional problem with my 2018 headunit not recognizing my iphone for carplay. Usually a full restart of the unit would fix it- you can do this by holding the volume/power knob down until it fully shuts down. (A quick press will only turn off the display)
It's strange that it's happening more often for you, mine hasn't done it recently (though it was often for a brief period). There is also an option to update the firmware in the settings via wifi- may want to see if yours can be updated.
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