Airpod pros active noise cancellation seems to activate with loud noises normal

This is typical of an interference between Bluetooth and other electromagnetic waves (Wi-Fi in an office or appartment environment, remote commands in every environment, wireless phones in every environment, microwave oven leaking in an office or appartment environment…).

One of the only thing you could do if at all possible is to suggest all Wi-Fi administrators around you (at least the ones who might understand) to switch on 5GHz band channels (36, 40, 44…) so as to reduce these interferences. Their networks will work better too.

This problem will increase regularly with the increase of Bluetooth and Wi-Fi use everywhere. This problem will stay hard to identify and to aknowledge since the channels used by Bluetooth are changing regularly (purposefully to avoid this interference problem ?).

You can limit this problem by stopping Wi-Fi within your own environnment. And moreover, to make everyone laugh, you might surround you with a light metal wire mesh the kind used to make garden fences ? (avoid the aluminium screen because it's an urban legend).

Another note on the funny side, these network drop is a free nice detector that you are in an overcrowded electromagnetic waves environment.

The effect you are describing is commonly referred to as "eardrum suck". It's a common complaint for any type of noise-cancelling earphones.

Only some people are sensitive to it, and the stronger the noise-cancellation, the more likely it will bother you. Headphones seem more likely to cause it than earbuds.

According to Brent Butterworth, a headphone reviewer, it's an aural illusion caused by the nature of noise cancelling circuitry (there is no pressure on your eardrum, it just feels that way). It's a little difficult to explain succinctly, but this article goes into all the details: https://www.soundstagesolo.com/index.php/features/178-eardrum-suck-the-mystery-solved