Metrics stop being recorded after restarting the container

[Coffei]

Hi,
we are using this image to track metrics of our app and found the following problem.

Whenever the container is restarted it stops tracking the metrics. I have to recreate the container to make it work again.
I checked and the packets are still arriving into the container, also statsd is still running. Tried to kill statd and let the supervisor restart it, that didn't help.

Any ideas what can be wrong?