Here is the last .log I have,
I have to cancel a bad print after a few minutes,
when I cancel this, all the system freeze, the printer stop but i can't make anything in octoprint.
The, for this time, I disconnect the USB connection between the Raspi and the printer, then I reconnect and Login in octoprint, then i re-work.
Since this is a problem between OctoPrint and your printer, also post a serial.log. Your log file sadly doesn't contain anything that hints at what's going on here.
No, sadly not because you forgot to enable the serial.log. It's disabled by default for performance reasons. It's all explained in the topic that @tedder42 shared. Please enable serial.log, then reproduce the issue, then provide the resulting log.