Meteor methods stopped working on production on Galaxy

I had last deployed my app to Galaxy on Thursday. On Sunday evening the app started breaking. I discovered this on Monday morning. The app was up, but any method calls would not happen, or at least not return.

I redeployed the same branch I had deployed on Thursday and all was well again.

What could cause such an issue?

The app is running on 1 container. CPU usage was low with occasional spikes towards 70% - 100%. Memory was a bit over 50%.