Resends with M103 code GEN7 Board

Hi, i have a GEN7 V1.2 Board with latest firmware and used skeinforge to convert stl file to gcode.
I use RepRap Host program for send files to my prusa.
While sending gcode files, i see some a lot of request to resend lines and sometimes stop sending at all.
Does anyone know what happend?
Thaks in advice.

comms: G-code: N4688 G1 F1200.0 *65 dequeued and sent [2109,963s/0ms]
comms: Response: ok [2109,979s/16ms]
comms: G-code: N4689 G1 E382.0686 *65 dequeued and sent [2109,979s/0ms]
comms: Response: ok [2110,010s/31ms]
comms: G-code: N4690 G1 F840.0 *119 dequeued and sent [2110,010s/0ms]
comms: Response: ok [2110,041s/31ms]
comms: G-code: N4691 M103 *59 dequeued and sent [2110,041s/0ms]
ERROR: GCodeWriter.waitForResponse() - request to resend from line 4692.  RepRap said: rs 4692 Dud M code: M103 [2110,260s/219ms]
comms: Response: rs 4692 Dud M code: M103 [2110,260s/0ms]
ERROR: bufferQueue(): failed to send M103 [2110,260s/0ms]
comms: G-code: N4692 G1 X17.495 Y76.381 Z0.99 F2040.0 *47 dequeued and sent [2110,260s/0ms]
comms: Response: ok [2110,307s/47ms]
comms: G-code: N4693 G1 F1200.0 *75 dequeued and sent [2110,307s/0ms]
comms: Response: ok [2110,338s/31ms]
comms: G-code: N4694 G1 E386.5686 *76 dequeued and sent [2110,338s/0ms]
comms: Response: ok [2110,369s/31ms]
comms: G-code: N4695 G1 F2040.0 *72 dequeued and sent [2110,369s/0ms]
comms: Response: ok [2110,400s/31ms]
comms: G-code: N4696 M101 *62 dequeued and sent [2110,400s/0ms]
ERROR: GCodeWriter.waitForResponse() - request to resend from line 4697.  RepRap said: rs 4697 Dud M code: M101 [2110,681s/281ms]
comms: Response: rs 4697 Dud M code: M101 [2110,681s/0ms]
ERROR: bufferQueue(): failed to send M101 [2110,681s/0ms]
comms: G-code: N4697 G1 X27.256 Y66.619 Z0.99 F840.0 E386.9583 *110 dequeued and sent [2110,681s/0ms]
comms: Response: ok [2110,728s/47ms]
comms: G-code: N4698 G1 X27.772 Y66.619 E386.9729 *64 dequeued and sent [2110,728s/0ms]
comms: Response: ok [2110,759s/31ms]
comms: G-code: N4699 G1 X18.01 Y76.381 E387.3626 *126 dequeued and sent [2110,759s/0ms]
comms: Response: ok [2110,790s/31ms]
comms: G-code: N4700 G1 X18.526 Y76.381 E387.3772 *79 dequeued and sent [2110,790s/0ms]
comms: Response: ok [2110,837s/47ms]
comms: G-code: N4701 G1 X28.287 Y66.619 E387.7669 *75 dequeued and sent [2110,837s/0ms]
comms: Response: ok [2111,523s/686ms]
comms: G-code: N4702 G1 X28.803 Y66.619 E387.7815 *75 dequeued and sent [2111,523s/0ms]
...
..
..
comms: Response: ok [2132,100s/843ms]
comms: G-code: N4752 G1 X29.869 Y78.44 E398.0123 *119 dequeued and sent [2132,100s/0ms]
comms: Response: ok [2132,131s/31ms]
comms: G-code: N4753 G1 X41.472 Y66.837 E398.4756 *77 dequeued and sent [2132,131s/0ms]
comms: Response: ok [2133,005s/874ms]
comms: G-code: N4754 G1 F1200.0 *65 dequeued and sent [2133,005s/0ms]
comms: Response: ok [2133,036s/31ms]
comms: G-code: N4755 G1 E393.9756 *68 dequeued and sent [2133,036s/0ms]
comms: Response: ok [2133,941s/905ms]
comms: G-code: N4756 G1 F840.0 *124 dequeued and sent [2133,941s/0ms]
comms: Response: ok [2133,972s/31ms]
comms: G-code: N4757 M103 *48 dequeued and sent [2133,972s/0ms]
ERROR: GCodeWriter.waitForResponse() - request to resend from line 4758.  RepRap said: rs 4758 Dud M code: M103 [2135,111s/1139ms]
comms: Response: rs 4758 Dud M code: M103 [2135,111s/0ms]
ERROR: bufferQueue(): failed to send M103 [2135,111s/0ms]
comms: G-code: N4758 G1 X40.839 Y67.985 Z0.99 F2040.0 *46 dequeued and sent [2135,111s/0ms]
comms: Response: ok [2135,157s/46ms]
comms: G-code: N4759 G1 F1200.0 *76 dequeued and sent [2135,157s/0ms]
comms: Response: ok [2135,189s/32ms]
comms: G-code: N4760 G1 E398.4756 *68 dequeued and sent [2135,189s/0ms]
comms: Response: ok [2135,220s/31ms]
comms: G-code: N4761 G1 F2040.0 *66 dequeued and sent [2135,220s/0ms]
comms: Response: ok [2135,251s/31ms]
comms: G-code: N4762 M101 *52 dequeued and sent [2135,251s/0ms]
ERROR: GCodeWriter.waitForResponse() - request to resend from line 4763.  RepRap said: rs 4763 Dud M code: M101 [2135,423s/172ms]
comms: Response: rs 4763 Dud M code: M101 [2135,423s/0ms]
ERROR: bufferQueue(): failed to send M101 [2135,423s/0ms]
comms: G-code: N4763 G1 X29.869 Y78.955 Z0.99 F840.0 E398.9136 *97 dequeued and sent [2135,423s/0ms]
comms: Response: ok [2135,485s/62ms]
comms: G-code: N4764 G1 X29.869 Y79.471 E398.9281 *67 dequeued and sent [2135,485s/0ms]
comms: Response: ok [2135,516s/31ms]
comms: G-code: N4765 G1 X40.673 Y68.667 E399.3595 *68 dequeued and sent [2135,516s/0ms]
comms: Response: ok [2135,547s/31ms]
comms: G-code: N4766 G1 X40.623 Y69.233 E399.3755 *72 dequeued and sent [2135,547s/0ms]
comms: Response: ok [2135,579s/32ms]
...

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Mendel Prusa with Gen7 v1.2 PCB , Wade's extruder 0.7mm. Custom Heated bed.
"BIG" Mendel Pusa with modified Gen7 V1.3 PCB , Wade's extruder 0.5mm with modified hotend (about 500x600x450mm printable area) <--- under construction
Plastics: Black PLA, Soft PLA, White ABS
Software: Skeinforge 4 for STL to GCODE, RepRap Host for print GCODE. Blender for STL designs.

Sorry, just learn M103 and M101 codes aren't for stepper motors. isn't a firmware problem.
Just create a replace.csv form skeinforge and works ok.
Thanks.

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Mendel Prusa with Gen7 v1.2 PCB , Wade's extruder 0.7mm. Custom Heated bed.
"BIG" Mendel Pusa with modified Gen7 V1.3 PCB , Wade's extruder 0.5mm with modified hotend (about 500x600x450mm printable area) <--- under construction
Plastics: Black PLA, Soft PLA, White ABS
Software: Skeinforge 4 for STL to GCODE, RepRap Host for print GCODE. Blender for STL designs.