M112 Emergency Stop, no signs of problems otherwise  

M112 Emergency Stop, no signs of problems otherwise

I've been running my MK3S pretty hard but with zero problems for the last couple of weeks. Today I was printing a file that I've printed many times before. It's about 8 hours long, 150mm high at max, nothing special. I left to run an errand when it had about 2 hrs left and came home to "M112 Emergency Stop" error. Never seen this specifically before, but it looks like it can be triggered by bad thermistor wiring. Is there anything else I should check? I will probably go ahead and order a replacement bed thermistor, but I don't want to overlook something obvious. I have this log from the Octoprint terminal as well:

Send: N291024 G1 X130.304 Y106.450 E0.17827*86
Recv: ok
Send: N291025 G1 X123.480 Y99.626 E0.64474*100
Recv: ok
Send: N291026 G1 X123.480 Y96.957 E0.17827*111
Recv: ok
Send: N291027 G1 X133.210 Y87.227 E0.91930*101
Recv: ok
Send: N291028 G1 X134.166 Y87.305 E0.06408*102
Recv: INT4
Recv: UVLO - end 414
Recv: \x00echo: 3.9.0-3421
WARNThe received line contains at least one null byte character at position 0, this hints at some data corruption going on
Communication timeout while printing, trying to trigger response from printer. Configure long running commands or increase communication timeout if that happens regularly on specific commands or long moves.
Send: N291029 G1 X134.265 Y88.510 E0.08072*109
Recv: echo: Last Updated: May 18 2020 17:11:15 | Author: (none, default config)
Recv: Compiled: May 18 2020
Recv: echo: Free Memory: 1675 PlannerBufferBytes: 1792
Recv: echo:Hardcoded Default Settings Loaded
Recv: adc_init
Recv: CrashDetect ENABLED!
Recv: FSensor ENABLED (sensor board revision: 0.3 or older)
Recv: echo:SD init fail
Recv: Error:Line Number is not Last Line Number+1, Last Line: 0
Recv: Resend: 1
Printer requested line 1 but no sufficient history is available, can't resend
Changing monitoring state from "Printing" to "Error: Printer requested line 1 but no sufficient history is available, can't resend"
Send: M112
Send: N291030 M112*24
Send: N291031 M104 T0 S0*25
Send: N291032 M140 S0*94