Many suites fail to complete, with a timeout, on many different boards:

https://uberchromegw.corp.google.com/i/chromeos/builders/wolf-tot-paladin/builds/6443
HWTest [bvt-inline]
Suite timed out. Started on 04-20-2016 [23:26:56], timed out on 04-21-2016 [01:04:12]

https://uberchromegw.corp.google.com/i/chromeos/builders/auron-b-release-group/builds/1473
HWTest [gandof] [bvt-inline] provision_AutoUpdate.double: ABORT: None
Suite timed out. Started on 04-20-2016 [23:27:04], timed out on 04-21-2016 [01:32:30]

https://uberchromegw.corp.google.com/i/chromeos/builders/beltino-a-release-group/builds/2087
Paygen [panther]
Suite timed out. Started on 04-20-2016 [22:14:36], timed out on 04-20-2016 [23:50:01]
HWTest [mccloud] [bvt-inline]
Suite timed out. Started on 04-20-2016 [22:10:45], timed out on 04-21-2016 [00:12:59]

https://uberchromegw.corp.google.com/i/chromeos/builders/beltino-b-release-group/builds/2100
Paygen [tricky]
autoupdate_EndToEndTest.paygen_au_canary_full      FAIL: Failed to receive a download finished notification (download_finished) within 600 seconds...
HWTest [tricky] [bvt-inline]
Suite timed out. Started on 04-20-2016 [22:27:04], timed out on 04-21-2016 [00:30:57]

https://uberchromegw.corp.google.com/i/chromeos/builders/jecht-release-group/builds/1404
HWTest [tidus] [bvt-inline]
Suite timed out. Started on 04-20-2016 [22:36:36], timed out on 04-21-2016 [00:41:58]
Paygen [rikku]
Suite timed out. Started on 04-20-2016 [23:33:56], timed out on 04-21-2016 [01:09:42]

https://uberchromegw.corp.google.com/i/chromeos/builders/rambi-d-release-group/builds/1725
Paygen [banjo]
Suite timed out. Started on 04-20-2016 [22:30:43], timed out on 04-21-2016 [00:06:30]
HWTest [banjo] [bvt-inline]
bvt-inline                                FAIL: Exception waiting for results
HWTest [sumo] [bvt-inline]
Suite timed out. Started on 04-20-2016 [22:20:48], timed out on 04-21-2016 [00:25:09]

And some more here:
https://uberchromegw.corp.google.com/i/chromeos/builders/wolf-paladin/builds/10777
https://uberchromegw.corp.google.com/i/chromeos/builders/rambi-b-release-group/builds/2297
https://uberchromegw.corp.google.com/i/chromeos/builders/rambi-c-release-group/builds/2190
https://uberchromegw.corp.google.com/i/chromeos/builders/rambi-e-release-group/builds/1029
https://uberchromegw.corp.google.com/i/chromeos/builders/slippy-release-group/builds/3631
https://uberchromegw.corp.google.com/i/chromeos/builders/strago-b-release-group/builds/549
https://uberchromegw.corp.google.com/i/chromeos/builders/veyron-b-release-group/builds/1473
https://uberchromegw.corp.google.com/i/chromeos/builders/nyan-release-group/builds/2750

This really looks like some kind of network issue in the lab...