I agree with some of what's said here, a Novak motor or ESC is designed to shut down to prevent over heating with a cutoff that will kick in between 190 and 200 deg f. I have only on one occasion (running a 4.5 in too long grass) had it shut down, but following it cooling down both ESC and motor were/are fine. I'm not suggesting you routinely take your motor and speedo to the thermal cut but if you've done it occasionally I wouldn't lose any sleep.
Sintered rotors are much more resilient to heat, being an L motor it defo does have a sintered rotor. I guess this offers no help as to why it's gone though, you've have to send it in for inspection to find that out.
I do agree a temp gun is very handy and that generally 150degf is a sensible limit, though if necesary (a national say) I'd take it toward 170 again without losing too much sleep.
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