Moved from Windows a few months ago where I didn't have this issue, used my Steamdeck as a PC for a month while I repaired my PC and I didn't have this issue. It is not an issue with my ISP or connection
I'm unsure where to start with troubleshooting, but at random my internet drops out, and its usually in clusters. It lasts for only a couple seconds but apps take time to recover and reconnect.