Ok so the first step of being crazy is saying I’m not crazy. Now that, that’s over with… for the past three months I have had random noise go off in my living room that sounds like the last few notes of a xylophone or piano(high pitched) and doesn’t last more than two seconds. I assumed it is something like an Air Tag or another device identification tag but I have set off all of my devices and nothing sounds like that. Perhaps it’s a device notification sound from something saying “hey dumb*ss you left me on are you still there?” It’s not my fridge(living room and kitchen are same floor). I thought I was going crazy until tonight my wife and I were chatting and she was like wtf is that. I use Alexa for all my voice controlled automation for smart devices and we are an iOS household for anything besides our work computers. Any ideas would be helpful! UPDATE: I have solved it from another reddit post! Apparently our Furbo dog treat machine is voice activated and when it thinks I have said “Hey Furbo” it lets out that little chime as acknowledgment. Thanks everyone!!
There exists a tiny device that is designed solely to beep at you in odd and random intervals in order to drive you crazy. Do your friends like pulling pranks?
Brett said:
There exists a tiny device that is designed solely to beep at you in odd and random intervals in order to drive you crazy. Do your friends like pulling pranks?
I’ve used these, they’re called annoyatrons.
Smoke detector low on battery, if it’s a chirping sound.
Luchivya said:
Smoke detector low on battery, if it’s a chirping sound.
That is something familiar to me. I got a bunch of 9volts at the ready. It’s not a chirp. More like someone strumming a xylophone. Although I’d say that would be nicer sounding but less enticing to change the battery 
@Kaitlyn
Haha, at least it’s not annoying as the smoke detector.
I have a tablet that will make random notifications. Could never figure it out. It is a s6 lite. 
Bright said:
I have a tablet that will make random notifications. Could never figure it out. It is a s6 lite.
I thought maybe it was my iPad but that bastard has been downstairs since I started hearing the noise. The only mobile device I have up here is my phone. But thanks for the reply! I’m taking all I can get
Washing machine, dryer, dishwasher, microwave. All things in my house that make jingles.
Allen said:
Washing machine, dryer, dishwasher, microwave. All things in my house that make jingles.
Washing machine and dryer are from Samsung and make the most wonderful jingles. Dishwasher, microwave and others are Bosch which from their German roots beep like I intruded the house and need to find my grave plot. Have ruled out appliances for the time being.
I have a WiFi amplifier that makes a tone like this when it connects to the Internet or reboots.
@Allen
All of my networking equipment is ubiquiti and hardwired back to my server room. Have you had any experience with a wifi connected fireplace? I just removed the grate and see that the controller to the gas and ignition is wifi enabled. Could it be that going on and off of connectivity?
@Kaitlyn
Just a thought. Unplug and plug in one of your Alexa devices. See if it makes the noise. I do not have a smart fireplace, so I couldn’t tell you.
Allen said:
@Kaitlyn
Just a thought. Unplug and plug in one of your Alexa devices. See if it makes the noise. I do not have a smart fireplace, so I couldn’t tell you.
Ok will do thanks!
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Kayla said:
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OP’s wife also heard a noise.
My microwave makes weird sounds during night, one day I found out and changed a new one
Do you have a wind chime in your living room? Maybe the A/C is hitting it.
Noah said:
Do you have a wind chime in your living room? Maybe the A/C is hitting it.
No wind chime on our house. It’s like a very consistent strum of a xylophone versus a sporadic ding.