Hello,
Was the wireless interface stopped intentionally or is it usually in this state? It is possible that the wireless interface enters the "Stopped" state if something is wrong with the general configuration of either generic WiFi configuration itself or any specific wireless interface setting. Could you please generate and send me over a troubleshoot file with private message?
What's a troubleshoot file and how to generate it?
A Troubleshoot file contains a device's event logs, configuration files and other info useful for diagnostics. It can be downloaded from your device's WebUI, Troubleshoot page:
System → Administration → Troubleshoot
Best regards,
Tomas.