Hi, we're facing a extreme confused situation. We're staying in this new bto flat for almost 3 yrs & we're staying to TOP floor. Been hearing strange noise for more than 2+yrs times. Those noise are humming+knocking, sound like humm..... then click knock. It started every evening time to late 1 to 2am then stop, started again around 4am until 7-8 morning. Sometime we can hear it at the lift area now then discover that noise are actually from lift itself. But it's weird that the sounds can be heard although we're away from lift area and volume is adjustable, something softer something louder, like someone is controlling it. Strange part is while closing all our doors and windows, the noise is louder than outside. We're suspected my downstair neighbor is the cause of those noise, bcos while we flash toilet in the midnight after a while the noise started again. We even heard stomping and dropping things totally was like in our unit but we're all sitting in the sofa watching TV, remind you all again, we are living in TOP floor. Getting more weird is this few weeks, we can hear soft bass knocking sound surrounding our living and bedrooms whole days and nights, and again the sounds is adjustable. My question is if it's from my downstair neighbor, how will they able to do that? Are they facing loudspeaker to us? Are they not affected? They're like very 'careful' neighbor, avoiding and hiding, scare someone will complain against them. Anyone can help to solve?