My wide-band worked fine after the install and cal process per the manual. Drove the car to work, got a good data log with real WB AFR numbers.
Drove the car home, and the WB was live, but never went below 12.0 or above 12.9, at least from what I could see with the numbers flashing.
I thought my placement of the module in the engine compartment might have heat soaked it or something, so I moved it further from the engine.
Let it cool, no luck.

On a whim, I re-ran the sensor cal process, with the sensor still installed, after the car had sat for 8+ hours, the process was successful, got good AFR numbers.
Took a ride, did a log, everything fine, AFRs at WOT matched previous numbers.
Played with my tune a little, started the car to drive home, and the WB is back to not going out of the 12's, though the car is running fine.

This is in a C6 Z06, LS7, with stock exh manifolds and cats.
I added a bung at about the same location as the OEM NB, just clocked a little different.
Figured this would be ok flow and heat wise, but I know nothing.

Any ideas about why I'd have to re-cal the unit after every run cycle?