Forums  /  Super Mario  /  MIPS glitch didn't work during last run?

I'm doing Super Mario 64 16-Star runs on console mostly, but in my last run, the MIPS glitch suddenly stopped working - altough it worked perfectly in the past runs.
After dropping MIPS in the “corner“ of the first door you have to clip through, Mario either just clipped through the door completely so that I couldn't get MIPS from its other side and had to go back through it, or Mario didn't clip into the door at all.
And of course, until the problem with the MIPS glitch, I was on the best way to a new PB... 🙁

What can be the cause of such a problem? I suspected a tilted or dirty cartridge, but this was not the case.