I believe that is the default setting in Simplify for the Da Vinci. I have been using the default settings with no issues and even turn the speeds up part way through most prints with no issues. I don’t think it is a power problem or a speed problem. I’d guess there is something getting in the way, are all your cables out of the way? Does this only happen on a specific print or no matter what you print? Have you tried recalibrating your bed? Also what firmware are you running?
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This is common with the Da Vinci. Check the wiring going to the X motor. That wiring bundle goes through a lot of stress with the sharp bend so some of the wires tend to go bad and break the connection momentarily. This causes the motor to skip steps.
Have you tried changing the below firmware setting? Seems to be fixing the issue for some users.
#define ALWAYS_CHECK_ENDSTOPS 0
Guys, the community of Da Vinci’s 1.0 very often ask for some helpful tips on printing Marvins: I have collected a few over Here 4 , but it’d be really cool if we could get some more input 
I have the da Vinci myself and I know of two issues that cause this, both of which I’ve experienced. First is the belt slipping, which doesn’t usually happen especially on new printers but make sure the rails stay lubricated, since they are prone to sticking if they’ve sat still too long or you’re printing a lot. The second is a bit more general, and happens because the stepper is receiving insufficient power. On the Da Vinci this usually happens on the x axis, and you can solve it completely just by slowing down the print a bit. Something about max power throughout on the Due (which the da Vinci runs on)
7 months later
hi, i seem to have problems printing anything with z height above 100mm or so, the extruder seems to drag the print off the bed. i assume this is due to wrong z steps setting, has anyone got a quick solution? cheers 
16 days later
I had the same problem with shifting prints on my davinchi AIO it ened up being the pins in the connector on the stepper motor were loose and when the print was larger and it was moving allot they would move in such a way that it would disconnect itself from the stepper i was able to fix it by using superglue pushing the pins in and apply small ammount of supper glue held the pins in
13 days later
This is a known problem with the DaVinci printer(s). If you are having an issue with a loud ratcheting noise and the print head shifts position to the right or left, odds are good that it is a broken wire or bad connection in the X axis wiring harness.
8 months later
Had my 1.0 for almost 2 years. I’ve had a very similar problem, sounding exactly as you described. Nothing I tried worked, went through almost an entire cartridge before I gave up. The death sentence came when tech support advised I ship the 57lb printer to them and import it back - pointless since the whole act of shipping and receiving it exceeded the cost of a whole brand new printer by USD$100… a $400 cost I won’t gamble on. A short while ago, I ordered a different brand.