Strange download speed over a mobile network.

[scherbakov.al]

I compared the speed of the cellular network to two applications - a native application from Qobuz and USB player. I tested one quality track 24-192. How the native application works:



At first there is a surge in speed, and then the speed rhythmically jumps, but the recording is not interrupted: 



USB player for some reason behaves differently:




Changing the buffer size, network packet size, client type does not change the result. Why is this happening? The official application is able to maintain a constant speed of downloading music, and with a USB player, communication is constantly interrupted.