Server: amazon linux ami latest, NGINX as proxy server IDEMPIERE 3.0.0.v20150227-1538, JAVA 7. Client Mac Yosemite latest Chrome, Latest.
daily 2-3 times server stop to respond web client for 1-2 min then ERRROR MESSAGE: Unexpected token < (Syntax Error) APPEAR. after OK-ing it client session continue properly.
no any special log server side.
sure need further investigation
the issue was caused by wrong chars in our local installation theme css.
cant reproduce on official demo.