Turned off all banner and inter ads and now it doesn't crash.
For reference:
Unbounded scrolling: Yes
Fullscreen in browser: Scale outer
Fullscreen scaling: High Quality
Use high DPI display: Yes
Orientation: Portrait
Enable WebGL: On
Sampling: Linear
Downscaling: Medium quality
INTEL XDK
Crosswalk version 11
Cranberry admob plugin
Left Cranberry admob plugin in build (just in case I use in later)
Deleted all references to admob within app (no calls)
Exported app now runs without crashes
With admob test ads set at image only was getting less than 30 fps
Without admob getting between 50 and 60 fps
Layout size 768 x1366
Window size 768 x 1024
Very frustrating day