There are a few different reasons why you would see that message:
The SX80 is connected to a speaker that can't play at the frequencies required for Proximity to work.
The SX80 is connected to a 3rd party microphone that can't record at the frequencies required for the ultrasound diagnostics.
The microphone is placed in an unfortunate location relative to the speakers or a nearby source of noise.
Anyways, if Proximity is working you can safely ignore the message.
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