I'm not really sure why the new shield would be different than the old one. Other users here are using the new shield and tube and not experiencing the same freezes, so there is something specific to your environment that is part of the cause. I can't tell at this point if it's signal related or network related from the information in the logs. Without being able to reproduce it myself it is going to be very hard to find a fix.
One thing you could try is swapping the working shield with the new one to see if the new one works in the same location and network connection setup as the old one.