Instead of adding to a thread from 2015, please open new questions, thanks.
You can collect client connectivity logs from the Administer::Diagnostics page, select Client Association in the debug components.
After time, click Save Debug Info to collect the logs. Analyze your logs on the Support site "Rowdy" tool:http://loganalyzer1.ruckuswireless.com/Rowdy/
You could also save the System Logs from the box below debug logs. These show AP connectivity as well as client activity.