Try changing the channel (press the channel button while your are in a call).
You already stated that there is no other electronics around (sometimes fluorescent lights might be a nuance), so if the channel fix does not work, the next probable cause is the radio transmitter in the phone. Unfortunately, that is beyond the common user reach. You would need to replace electronic parts).
Good luck!
Try first to do a power cycle on the phoen, by turning it off for about 30 minutes if still the same problem better reset the settings of the phone...
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