I'm using Simplify3D V4.1.2 in Windows 10. During print, the printer freezes randomly for a second or moves the extruder to the bed border and returns to print.
In the case of movement to border, the log shows it:
SENT: G1 X146.314 Y67.973 E8.4475
SENT: G1 X146.801 Y67.409 E8.4921
Unknown command: "194X161.111 Y70.434 E15.1399"
Unknown command: ":1 X125.434 Y134.905 E20.7014"
Unknown command: "95.X145.548 Y69.550 E8.3773"
Unknown command: "3 X140.527 Y127.831 E4.7018"
Unknown command: "1 X179.066 Y82.315 E13.6013"
Unknown command: "A1 X113.783 Y120.256 E22.0052"
SENT: G1 X119.682 Y92.689 E23.7645
SENT: G1 X119.368 Y91.741 E23.8244
The numbers of unkown commando varies.
Using Repetier Host the problem doesn't occur. On my previous computer (Win10 + SD3D 4.1) the problem also occurred.
I realized that the problem occurs more often when the part has more curves.