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Random thought of the day. Batteries really kill the size of a mod. Especially a 2 cell mod.
The OLED turning off issue. I have seen at least two cases where it was a problem with code not hardware. Maybe try disabling most of your script and adding it one section a time and see if there isn't a problem area.
If the one from Adafruit is working and the one from Crystalfontz is not, there has to be some difference there, maybe not the display controller, but some difference somewhere.You tried two different builds, yeah? Did you also use two different displays or the same one on both boards?. It's actually pretty rare to get bad parts, but it does happen. If you've only tried one display, you've not ruled that out.
If in fact that Craig's suggestion is not related to your choice of I2C or SPI.............It sounds like something I experienced using a Nokia 5110 display. The design flaw is the displays contact points on the back of the display. In your case it's the FPC connector. My problem would temporarily be remedied when applying pressure to the contact point and reinitializing. In your case it's re-soldering the connector.It's probably a poor design of the FPC meshing up w/ the ribbon cable.
It's not a likely cause, but you really need to rule out a bad display. There have been a couple times where I've run around in circles for a while assuming a part was operating to spec when it was not.Well again, I hope you find the problem easily.