Modular Bed Error - how to fix?  

Modular Bed Error - how to fix?

I keep getting a modular bed error.  It doesn't happen with every print but often enough that it is annoying and, due to the fact that it often happens part way through a print, wasting a lot of filament.

It seems to always be on tiles 14, 15, or 16.  And it seems like the error is sometimes something about the temp being too low and sometimes a temperature "peak".  Recently, it has been that there was a temperature peak on a tile.  this last time I got a picture of the error screen.

"Heatbed tile 16: Unexpected temperature peak detected.
More info at prusa.io/17255"

Also, when this has happened, the print job is never even on tiles 14, 15 or 16.   I usually have my print jobs is the front left corner of the print bed.

I have seen the troubleshooting steps for this error but, they seem to assume that the problem is ALWAYS happening and that you will know right away if moving the cable worked.  But, since this isn't happening every time, how to I really test it without wasting a ton of filament?