Saturday, Jaxx experienced a massive spike of Zcash that overwhelmed our back-end and disrupted Zcash services for a period of time. We were able to restore services but realized we were not equipped for the size of the load we were (and are) experiencing. Monday we will be focusing on improving the capabilities of our Zcash servers so that this doesn't happen again. Sorry for an inconveniences this may have caused and know that as I'm writing this everything is working fine and has been since yesterday afternoons EST (Saturday).
edit from @paige for clarification: "Dash servers" -> "Zcash servers"