I also encountered the same issue. Our spare would take over, failback to the primary for 30 minutes or so, and so on. I rolled back the software for now and opened a case. All of our other devices(Z3, MX80, Z1) all upgraded successfully.  ... View more

Thats what we ended up doing too. Ironically, I had my workstation on a policy that bypasses everything so all of my Google Apps were working...and thankfully from a similar situation about a month ago, I was led into trying removal/altering of Layer 7 rules.    Bingo.  ... View more