Hi Steffen,
I'm afraid that does not help. It crashed again after a few seconds. Last log output:
2016/11/28 16:45:57.577997 sync.go:107: DBG Try to publish 2048 events to logstash with window size 619
2016/11/28 16:45:57.962668 window.go:51: DBG update current window size: 619
2016/11/28 16:45:57.962696 window.go:55: DBG set to max ok window size: 825
2016/11/28 16:45:57.962718 sync.go:78: DBG 619 events out of 2048 events sent to logstash. Continue sending
2016/11/28 16:45:57.962727 sync.go:107: DBG Try to publish 1429 events to logstash with window size 825
fatal error: runtime: out of memory
runtime stack:
runtime.throw(0x980692, 0x16)
/usr/local/go/src/runtime/panic.go:566 +0x95
runtime.sysMap(0xc586780000, 0xb38f0000, 0x7fce8bc3cf00, 0xcc8418)
/usr/local/go/src/runtime/mem_linux.go:219 +0x1d0
runtime.(*mheap).sysAlloc(0xcaec20, 0xb38f0000, 0x7fce00000001)