Okay - somewhat the same with us - usually, good the first time. 1/10 a crash, etc. Hard to run it again, unless we close browser, sometimes restart, etc. So there is probably something causing it. The raw three.js examples (non ZIM - from their list of examples) do not crash like this as far as I know. Maybe you can try one or two of those:
Then search for vr and it is after vrml there is a bunch of vr examples.