Are you running the latest jloader boot code ? there was an issue identified a couple of years ago that meant they could brick themselves if they were writing to the flash during a power outage that was fixed with new boot code. As with all network gear you should be running supported firmware.

From: nznog-bounces@list.waikato.ac.nz [mailto:nznog-bounces@list.waikato.ac.nz] On Behalf Of Sam Russell
Sent: Friday, 23 May 2014 2:42 p.m.
To: nznog@list.waikato.ac.nz
Subject: [nznog] Juniper EX-series switches & flash memory

Hi all,

We've acquired a few EX-series switches recently and are a bit unimpressed at how they deal with power outages. Not wanting to trash talk here, just keen to see if anyone else is seeing this problem and ways they're dealing with this, off-list replies appreciated.

Cheers

Sam