Make sure you set the correct KBPS for your stream on configuration of software you use for do live stream, 192 or 320 Kbps, depending of your stream.
When you put in the configuration the KBPS higher than what your stream accepts, your server stream stop.
Way to solve the problem: it is necessary that you loging your control panel, and click on start your stream, from your control panel.
Remember use the correct KBPS in your configuration, not higher than the KBPS that your stream accepts. If you do the configuration correct on you software for do live stream, now your stream shouldn't stop.