Was doing vAA and I've done this a thousand times and I can quite easily permablock the axes, however I was finding my block was dropping and i was getting stunned often.
Ive never had problems here but it seems when blocking and I block casted a skill such as igneous shields the block dropped and took a while to reactivate, all the time I'm holding down block. This has never happened to me before. It also seemed to happen on other skills too.
Here is a video of it happening. Has something changed?
https://www.youtube.com/watch?v=R6-qXHtk_xA