Prior to this patch, I would have to summon my pet maybe one time per day, if that. I downloaded the new patch last night, and I had to summon my pet about 20 times through just wondering the world and a dungeon for a couple hours. The only dungeon my pet ever died at (prior to WB patch) was on White Gold Tower at the last boss when it'd run into the lightning explosion and I didn't have Hardened Ward up. Just running through Deshaan my pet would disappear. It died at a Dark Anchor. Died almost a dozen times in a single dungeon (Ruins of Mazatan - spelling) where it'd never had died before.
I read the patch notes, and the only thing mentioned about pets was that they had major expedition applied to them now to keep up. It seems something else has changed with them, as I can't even keep my pet active longer than 10 minutes now.