Glad/sorry to know I'm not the only one encountering weird PW behaviour. Glad, because I'm not alone in this, and sorry that you're encountering difficulty.
I've already had to restart my PW twice, to access downloads it thinks it's downloaded but hasn't. I also note that the WiFi indicator is usually only on 2 bars, where all the other household devices always have 3 bars (full signal). It is starting to look like a corruption issue.
I'm impressed they have anyone there who remembers Fortran, whose main claim to fame back when I was an undergraduate (late 70s) was its ability to run Fourier Transforms (mathematical processes analyzing scientific data). The thought of anyone using that venerable programming language on "the latest" Kindle ... *snorts of laughter*
Then again, I'm trying to make sense of a statement which obviously didn't have that intent...