Repetier loosing connection everytime i click print!

hello everyone,
i got a German reprap neo 300 and i tired my first prints yesterday. everything went well at the beginning but after a while whenever i try to print something the printer disconnects. and i have to reconnect it manually. also i noticed that the temperature of the extruder is always 11-12°.. so i checked the log and found out that the M109 is the reason for the disconnection. but couldn't fix it..
[Log]
; generated by Slic3r 1.3.0-dev on 2018-01-19 at 16:48:03

; external perimeters extrusion width = 0.50mm (4.97mm^3/s)
; perimeters extrusion width = 0.58mm (11.78mm^3/s)
; infill extrusion width = 0.58mm (15.71mm^3/s)
; solid infill extrusion width = 0.58mm (3.93mm^3/s)
; top infill extrusion width = 0.58mm (2.95mm^3/s)

M190 S85 ; set bed temperature and wait for it to be reached
M104 S255 ; set temperature
G28 ; home all axes
G1 Z5 F5000 ; lift nozzle
[/Log]

any idea?
Thank you

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