Problem upgrading to 2.9.24

Hi
The last weekend i upgrade from 2.9.8 to 2.9.24 and i have some problem with my ethernet nics.
With 2.9.8 i don’t have problem with ping timeout or lost packet. When i upgrade to 2.9.24 i have a few problem with ping timeout and perfomance of my network. The ethernet nic is routerboard 44.
It’s the same network hardward, the only change is the version of mt.

Some suggestion or advice??

Maximiliano