I am also a network engineer, and self-healing routes are cool, no human intervention required to find the best route and they can take into account a lot of real time information And keep everything balanced with high QOS. There’s a ton of stuff at IEEE about them if you’re interested. The frustrating thing is that SmartThings gives us almost no tools to watch what’s going on. If you’re interested, there’s a Third party field tech tool kit you can buy, but it costs about 150 bucks so probably not worth it. Here’s the thread about it.
ZWAVE TOOLBOX: third party diagnostic tool
That said, if that motion sensor is only battery powered, something is definitely wrong, it should not be in the route at all. 
What’s the brand and model of the motion sensor?