Wagon server 'killed' on certain pages

On a previous project and now a current one, we face the problem that wagon is killed during page load on wagon.

Agrano Alto
Started GET "/events" at 2016-05-29 12:55:58 +0000
  Params: {}
  Timezone: UTC
  Detecting locale DE
  Found page "Events" [events]
  Completed 200 OK in 249.3ms


Killed

This usually happens, before images are loaded/done loading as it seems.

On the engine it works totally fine.

Is this a known issue/any hints on the causes?