A loose manhole cover which sounds like “a gun going off” repeatedly is tormenting residents and business owners. The faulty drain along Lower Stone Street in Maidstone has beenloudly clanging for more than a month. Phoebe, who lives in a nearby flat, says the constant noise is causing her to toss and turn in bed. “I haven’t had a full night’s sleep since it started,” she said. “I’m having to use earplugs every night. “It weirdly sounds like a gun going off and also a train going over tracks. “I don’t rest at night and I don’t relax during the day. It’s around the clock, constantly affecting m…