Teddy, I would not worry in your place. UDP protocol, as it appears, is used by Zwift to send data about other riders to your computer. You may be getting several updates per second, but Zwift works fine even without these updates for up to 3 seconds. If it does not get UDP packets for 3 seconds or more, all other cyclists disappear and you are left riding alone. If you do not encounter any of this, you are fine. And even if other riders disappear, you can continue riding as usual - when UDP data starts streaming again, riders will re-appear. UDP is a one-way protocol without confirmation of receipt, so “UDP network disconnects” just means a lost in transit (or, possibly, delayed?) data packet… which is not critical at all because each next one supersedes the previous one.
I see a good amount of these lost UDP packets as well.