Hi @kha0S
Welcome to the Sonos Community!
Okay, one thing immediately jumps out at me on your diagnostics - you’ve disabled the Wi-Fi interface on your Arc and Beam. Your surround speakers rely on a direct, 5GHz connection between them and your Home Theatre primaries.
Please go to Settings » System » [room name] » Arc/Beam » Enable Wi-Fi and restore WiFi on both your Arc and Beam.
Please also re-enable WiFi on both of your Play:1s: Settings » System » Office » Play:1 (LS)/Play:1 (RS) » Enable Wi-Fi. Once done, disconnect both the Play:1s from ethernet.
I’m not convinced this is the cause of the “beeping” you hear, but I highly recommend you take these steps.
If the beeps persist after taking these steps, please try tapping the microphone button on your Beam/Arc to see if it is indeed Alexa making the noises - with microphones disabled, you should no longer hear them.
Please also note that the last time I heard of such a report, it turned out (after much troubleshooting) not to be Sonos that was making the noises - are there any other devices nearby that could be making these sounds?
I couldn’t see any evidence of events that might cause such sounds in the logs - how long before submitting the diagnostics did you hear the noises.? If you can submit a support diagnostic immediately after hearing them, they might be easier to find - I’d be happy to look again if you can submit some more diagnostics (please also mention which room it was heard in, unless they both go off at the same time?).
I hope this helps.