If there is any temporary network problem or bandwidth restriction (e.g. It's designed for live video streaming, where dropping packets is preferable to delaying the video stream.
Unfortunately UDP is an inherently unreliable protocol, as it does not guarantee delivery of the data packets. So try setting this to "RTSP UDP" and let me know if this resolves the problem. I have emailed you directly with a link to a beta version of SecuritySpy with this feature that you can test. This option is in the Format menu in the Video Device Settings window.
So, I have added an option to the ONVIF profile in SecuritySpy that allows you to choose between TCP and UDP transport for the media streams. It's possible that the camera doesn't correctly implement the heartbeat messages when using TCP transport: this may account for the difference between SecuritySpy and the other software you are referring to. By default SecuritySpy will use TCP whereas other software may use UDP. There are two types of heartbeat message depending on the method of transport protocol used for the media streams (TCP or UDP). I'm pretty sure SecuritySpy is sending them correctly, otherwise we would have heard this problem from lots of users, and this is the first we've heard of this with any camera. If it's a very regular disconnect exactly every two minutes with an immediate reconnect, then this does sound like a problem with the heartbeat messages.
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