Why does my laptop make bleeping sounds at sporadic intervals?

I don't know. It doesn't happen every day. It's a maximum of 5 times a week so any prior cause is hard to pinpoint.

We know that the Windows system sounds are all .WAV files stored in C:\Windows\media. As a result, one possible way to determine the cause is to use Sysinternals/TechNet's Process Monitor (ProcMon) with a suitable filter to log processes which use these .WAV files.

1. Download and unzip ProcMon, say to a folder on the desktop.

2. Create a shortcut to the ProcMon executable and amend the shortcut's properties so it uses Run as administrator (a) ('Advanced' button) and has /NoConnect (b) appended as in the screenshot:

(This will run ProcMon as elevated but will prevent it from automatically capturing events.)

3. Run ProcMon from the shortcut and accept the EULA. (You only need to do this once.)

4. Press CTRL+L keys together so the Filter dialog appears.

5. Add a new filter as in the screenshot below:

... then Apply the change and click on the OK button to dismiss the Filter dialog.

6. If you shut down your PC after each session then save the filter so you don't have to keep recreating it each new session.

7. If you leave your PC running all the time then, in the Filter menu, select Drop Filtered Events so it is ticked:

(Logged events are stored in the swapfile.)

8. That's it. All that remains now is to press CTRL+E keys together to start capturing sound events then minimize ProcMon and wait for the next time your PC bleeps. ProcMon should then show you the process responsible for the sound event. (CTRL+E is also used to stop capturing; CTRL+X to clear the log.)

Hope this helps...

Here's what the beep sounds like

The beep in the video doesn't sound like any of the default Windows program event sounds.

On some laptops it can indicate a failing cmos battery I believe - having just had a failing cmos battery! Does your clock keep time ok?