What is the problem?
When I cancel a print, the communication with the printer often fails in error. See below extract from octoprint.log:
2019-11-01 10:39:45,299 - octoprint.plugins.tracking - INFO - Sent tracking event ping, payload: {'octoprint_uptime': 336619}
2019-11-01 10:45:55,554 - octoprint.util.comm - INFO - Changing monitoring state from "Printing" to "Cancelling"
2019-11-01 10:45:55,559 - octoprint.util.comm - INFO - Force-sending M108 to the printer
2019-11-01 10:45:55,560 - octoprint.util.comm - INFO - Force-sending M108 to the printer
2019-11-01 10:45:55,596 - octoprint.printer.standard.job - INFO - Print job cancelled - origin: local, path: AIM_anycubic_i3_mega_fan_duct_v3_lowprofile.gcode, owner: darkneo, user: darkneo
2019-11-01 10:45:56,146 - octoprint.util.comm - INFO - Changing monitoring state from "Cancelling" to "Operational"
2019-11-01 10:45:56,281 - octoprint.plugins.tracking - INFO - Sent tracking event print_cancelled, payload: {'origin': 'local', 'file': '8c079515b8ca55ff341495e2158c4ca1fecd2c77', 'elapsed': 5101}
2019-11-01 10:45:56,909 - octoprint.plugins.tracking - INFO - Sent tracking event print_failed, payload: {'origin': 'local', 'reason': 'cancelled', 'file': '8c079515b8ca55ff341495e2158c4ca1fecd2c77', 'elapsed': 5101}
2019-11-01 10:51:19,923 - octoprint.util.comm - INFO - No response from printer after 3 consecutive communication timeouts, considering it dead.
What did you already try to solve it?
So farjust reconnect the printer. Sometimes it works, wome I need to shutdown the printer and start it again....
Logs (octoprint.log, serial.log or output on terminal tab at a minimum, browser error console if UI issue ... no logs, no support!)
Additional information about your setup
This issue has never occured previously, I am thinking of an issue with the newest release... I am now in Version 1.3.12.
Thanks for your help 
octoprint.log (30.8 KB)