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We've had our faucet for only a few months and it has started turning itself on randomly. sometimes it runs for only a few seconds, other times it's a couple of minutes. once it starts there's no way to turn it off. we tried pulling the batteries, but it still runs. once it turns off we can pull the batteries but then it won't work even manually. At first we thought it might be interference from radio waves in motion sensor lights but now it even does it during the day. Super frustrating! Has anyone else ever experienced this?