Hi Mike, the log shows the activities after the XDK restarted. It doesn't give much information. If next time it happens, copy the log file before you restart the XDK. Also, we've found some crashlogs that are showing similar behavior. We are looking into it.
Mike -- my guess is the Emulate tab is causing your app to crash. There are references in the log to API calls for AdMob, which could only be from your code running in the Emulate tab. The Emulate tab doesn't have any actual code to support those calls, and is probably crashing as a result.
I suggest you "stop" the Emulate tab before you do your build, using the "stop" icon in the Emulate tab's toolbar. See this post for more workarounds > https://software.intel.com/en-us/forums/intel-xdk/topic/624417