Log stops here

G1 X110.592 Y138.873 E0.0413

G1 X110.354 Y139.111 E0.0497

G92 E0.0000

G1 E-3.2000 F3600

; process Process2

; layer 150, Z = 0.200

M106 S0

; feature skirt

; tool H0.200 W0.550

G1 Z18.160 F1200

G1 X177.725 Y125.602 F10800

G1 Z0.200 F1200

G1 E0.0000 F3600

G92 E0.0000

G1 X180.816 Y122.512 E0.1803 F600

G1 X205.295 Y122.518 E1.1898

G1 X205.513 Y122.527 E1.1988

G1 X206.664 Y122.623 E1.2464

G1 X206.926 Y122.658 E1.2573

G1 X208.172 Y122.888 E1.3096

G1 X208.440 Y122.953 E1.3210

G1 X209.655 Y123.312 E1.3732

G1 X209.905 Y123.400 E1.3842

G1 X210.991 Y123.843 E1.4325

G1 X211.220 Y123.950 E1.4430

G1 X212.253 Y124.493 E1.4911

G1 X212.471 Y124.621 E1.5015

G1 X213.452 Y125.263 E1.5499

Nothing really special. Only fan is getting stopped with M106 but no reason to disconnect.

But what exactly is happening. Disconnecting and rebooting server or pc are quite different problems. Also what pc are you running server on? If you use a pi I would guess on the power adapter not being a real power adapter but maybe just a usb charger. Pi is quite sensitive here.

You could also have a look at /var/log/syslog around the time it happens if you see any usb disconnects.