I have the same exact issue. It's listed as a bug on the github, not sure what is causing it or how to get rid of it. I can tell you I've uninstalled and reinstalled, tried different nsecs, tried with and without Amber, still an issue.  

 I am currently trying to replicate this somehow...  

 I'm not a regular github user, but it looks like these bug reports can be merged if thats actually a thing in github.

https://github.com/vitorpamplona/amethyst/issues/1099

https://github.com/vitorpamplona/amethyst/issues/1086