I "fixed" mine with tape, it's scotch tape but the shiny 100% transparent kind not the "magic" flat/matte kind, that kind didn't work. I suspect clear glossy packing tape would do the trick too.
I at least can use it until there is a fix or I decide I need to return it...
Hoping for a software fix... seems something software-signal processing related to me.
When I have 5 bars I can't get the signal to go down at ALL by holding the corner or any other area, if I was indeed "shorting" out the antenna you would expect some movement.
However if I am in a 3-4 bar area it goes down all the way to no service then you back up to 3-4 bars when I let go, so either its a different modulation on some of the towers or the Phone is having a fit/crashing out trying to hold onto the weaker signal/interference.