I have a very simple set of 4 pages. The simplest version has not external CSS, JS, images. Actually, text  & markup is identical, so I gave each one a different bg color just to see a difference. Let me know if you want me to send you a .zip.

Recipe:
1. Select first file
2. Launch Live Preview
3. Select next file (at end loop back to first)
4. Wait for Live Preview to switch to new doc
5. Repeat steps 3-4 until it fails and Relaunch dialog is shown

Details:
* Live Preview always starts ok with first doc -- problem is switching docs
* Do *not* have any other tabs open in Chrome so that it has to shutdown and restart each time
* Before any of my changes, I was seeing Relaunch dialog almost every time on the first doc switch
* With current changes, I'll eventually hit Relaunch dialog, but it takes *much* longer
* It's not required, but I had Dev Tools open to watch console