Also having the Fatal Errors.
Been saving day by day to see where the Fatal Errors are coming from on my end, so far I've got 2 repeatable ones.
First, UI. Sometimes I get the "exit" button overlayed the "continue, load, etc" buttons. The second that happens and I save, that save gives me FE.
Second seems to be Item Related, in my case, the Russian Doll. All saves up to Saturday are fine, but something about Sat and the Dolls has that save going FE too. The Doll has, however, been on my desk since day 1, before I even knew it was a story thing (now that I have a Q for it, it's gone, and the save FEs).
I can, however, do a continuous play from day one and get no FE's as long as I dont load a save.
I will also note, after the first FE, even on subsequent fresh play throughs the Fridge Door and the MC's Upstairs Side Table (condoms, recharger) tend to not work as intended (no animations). If I use them, and give it a second, I can still click things inside/around it as the game requires, just cant see what I'm clicking.