Devices connected and disconnecting without your input (malfunctioning) could be something to do with the firmware.

Hardware-based problems are usually firmware or physically damaged components, in my decade-long tech support experience.

At my place of employment, we see problems with newly deployed laptops using docking stations that are often resolved with firmware updates.

Update your firmware. Restart. Check for more updates.

I'd also be interested to know if unplugging everything you can then waiting a while to see if the beep persists. After an indeterminate, non-specific amount of time later, reattach the devices one by one and wait for beeps in order to narrow it down.

Devices connecting and disconnecting without your input (malfunctioning) could be something to do with the firmware.

Hardware-based problems are usually firmware or physically damaged components, in my decade-long tech support experience.

At my place of employment, we see problems with newly deployed laptops using docking stations that are often resolved with firmware updates.

Update your firmware. Restart. Check for more updates.

I'd also be interested to know if unplugging everything you can then waiting a while to see if the beep persists. After an indeterminate, non-specific amount of time later, reattach the devices one by one and wait for beeps in order to narrow it down.