Hey Idaho!
After reading your post about your Maverick I decided to grab my DVM and see just what my probes do with changes in temperature.
What I found is that the probes when cold show a very high resistance of around 1.2 Mega Ohms at 72 degrees.
Holding the tip of the probe under test with my warm finger the resistance begins to decrease to
.
I suspect that you may have gotten a tiny bit water down inside the probe that has reached the sensing element that is altering the resistance and inducing the error.
I have heard of this issue with the probed supplied with the Maverick 732 model and was aware of it when I purchased my new Maverick 733 model with the "up-graded" probes that are now apparently better sealed to moisture doesn't get into the sensing element.
Not having a failed probe I can only guess that heating the probe above 212 degrees for a period of time might drive the water out assuming that water is in fact the source of your problem.
The other thing you might consider doing is cleaning the probe's plug with some rubbing alcohol but my money is on water in the probe.
After a little more research in what Maverick uses as their sensing element I have determined that it is likely an NTC Thermistor.
The NTC Thermistor reacts inversely proportional to heat in that the hotter the element gets, the lower the resistance and very susceptible to moisture causing errors.
As you can see from my MAcGyver style test set-up I used both of my probes with
One connected to the Fluke DVM to monitor resistance the other plugged into my 733.
Probe resistance was 1.2 Mega Ohms @ 72 degrees F and dropping to 764 Kilo Ohms
@ 411 degrees F.
I went through this discovery process because I found your post interesting and just needed to know for myself.