High-pitched noise from Logitech Performance MX

I have two Logitech Performance Mouse MX devices – I loved using it at home so much, that I bought one for work! While they generally excel in comfort and usability, they're both a bit annoying in that I'll occasionally notice they emit a high-pitched noise when I'm moving them.

The noise is in a range similar to the electronic whine or squeal I hear from some CRT monitors or other electronics. However, I've owned and used many mice in my lifetime – optical, laser, wired, wireless; mostly Logitech, but some not – and this is the first I've ever heard such sounds from.

It seems especially odd that the sound only happens when I move the mouse. Since it's a laser mouse, which I believe has no moving parts aside from the wheel and buttons, I don't expect it should be behaving any differently in terms of noise generation whether it is moving or stationary.

Since it happens with both mice of the same model, and they appear to be functioning fine otherwise, I don't think it's a "hardware problem" per se. But it makes me wonder what makes these unique from other mice that I've owned?

In summary, the answer to a few questions would settle my concerns here:

1. What can cause this noise in a mouse like the Logitech Performance MX?
2. Is this expected behavior for these types of mice?
3. Does the noise indicate a hardware failure, or propensity towards early failure?
4. Can I do anything to reduce the noise? Will such changes impact device performance, reliability, or warranty?

As I grew accustomed to CRT whine some time ago, I believe I can also tolerate this noise in the long run. However, if there's anything I can do to reduce the noise without impacting the device's functionality or reliability – and especially if the cause of the noise is actually something that warrants concern – I'd like to know.