I am asking for help. Several / several dozen times a day in one of the rooms (in the wall) in the apartment you can hear "shooting / chirping", a singular but loud noise (a sound very similar to the so-called breaking in the bones, e.g. when bending the knee). The apartment is new (block commissioned in 2013). Today we turned off all electricity - the fuse box in the apartment - but the chirping did not stop. It closes both day and night, e.g. half an hour of silence, suddenly one cycle, in 5 minutes another cycle and silence ... ..we don't know what's going on .... we suspect electrics, but as I wrote above, after disconnecting the switch box, the chirping did not stop .... unless it was chirping "from the neighbor". Any ideas, hints ??? Please help !!!! ps. I have submitted the matter to the administration - waiting for a professional ....