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Handset has audio interference about every 10 seconds (swissshhhhing sound). Handset read out often says "out of range" during interference. I'm only two feet away from base unit. Speaker phone works fine. Exact same problem with another handset and base unit.
Audio interference approx. every 10 seconds on the handset plus handset says "out of range" when only two feet away. Same problem with two separate base station and handset packages. Speaker phone on base station works fine.