Printer randomly resets mid-print  

Printer randomly resets mid-print

Hi!

Our MK3S stops mid print (regardless of the height) and resets with no error message or else. As if somebody would have pressed the reset button. Here are more infos:

1. The printer is 4 years old and is used daily
2. The «resetting»occurs regardless if the print is made by Octoprint or from the SD card
3. Nothing changed in our setup recently
4.  I turned Octoprint logging on, and I observed 2-3 of those comments per day : Printer sent 'start' while printing. External reset? Aborting job since printer lost state.
5.  I found this : https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-others-archive/mk3-resets-while-printing/#post-70778 about grounding the board to the frame, I didn't try it yet since I wonder why it would suddenly become necessary.

I presume some part is getting old and needs to be replaced. What do you think I should replace first? My bet would be the power supply...

Best regards!