mid print with SD card stops

Hello,

I have a strange problem that start happening only 2 days ago, when i print using a sd card the print stop randomly. If i print using usb and prontoface all goes well, no problem.
the print stop printing because the ramps make a reset, I can see in the lcd the rebooting process. The hotend and bed goes to zero ºC, and the nozzle stay in the last instruction of the print.
In the paste i already make a lots of prints using the sd card and lcd with the sd reader, never have a problem util now.

Testes and conclusion i have already made:
-The lcd module is not directly connected to the printer, is not a vibration issue.
-The ramps and mega do not have overeating problems.
-When i printing from SD card the usb cable is not connected to the pc.
-Already formated the sd card fat 32 and problem still happens
-I do not have a second sd card, not sure if is a faulty sd card.

Hardware:
-the SD card is a kingston sdhc class 4.
-ramps1.4 and mega 2560
-lcd 20x4 ( [createc3d.com] )

Can some one have any clue what can be the problem?

Discussed here before many times.
Usually, this is caused by electrical noise in the flat cables between RAMPS and SD card reader/LCD.
Shielding solves this. Sometimes just wrapping the flat cables with aluminum foil is enough, proper shielded cable is the best solution.

Thanks,
Already put the cable shielded with aluminum foil, now testing...

Now +2h printing and no problems. I think the problems was solved.
many thanks

Edited 1 time(s). Last edit at 07/06/2015 11:16AM by filipeCampos.