P1S stopped mid print. No error, just displaying "Ready to print"

[Lexi]

Print Cancelled, but why and by what?

This is the edge case here. I didn’t see anyone else reporting the problem running the older FW version. 1.6.1.2 is what I am running on my P1P and I have not had this issue at all. To be fair, I have not printed any huge (>4 hour) prints in a while. The only other variable here is that I use Orca Slicer exclusively. I am not sure if that would make a difference though. Is this just a one off for you on the 1.6 FW? Have you printed any more since the single failure?

Try downgrading to FW 1.6.1.2.
And replace the SD card. Much cheaper than replacing the whole unit. ; )