sorry for the confusion, I realize the original post was on a Synology NAS; my response was that I am seeing the same thing on both a FreeNAS and an UNRAID NAS setup. In my UNRAID setup, I have Resilio Sync running in a docker container and it will be transferring in speeds well below 1M/s; but after I restart the container it will immediately starts executing at speeds above 10M/s. Over time it decreases back to under 1M/s until another restart. It operates just like software with a memory leak that will gradually start using more and more memory until a software reset (but in this case it's a bandwidth leak...)