"Rescheduled timer in the past"

Hi, have a little issue with a “Rescheduled timer in the past” error on on of my printers. Have a feeling the board is on the way out as it’s been fine until now. It’s an old printer running a RAMPS/Arduino and I can’t seem to work out what’s causing it.

Log: klippy.log - Google Drive

Any ideas?

I have a re-arm which I may put in it, but have another of the same printer with the same setup and that’s fine, which is leading me to think it’s the Arduino Mega.