What i also noted is that leaving it on, without reloading, after a while, the connection is lost...... but after unplugging and plugging back the network cable, it works again...
First i did think it could be the camera firmware, and so i did contac the manufacturer, who did a complete rewrite of the firmware. After that, i did test the camera under windows for 2 days without problem.
Strange.. could not find yet a logical explanation for this behavior under lmce.