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This post should help -
http://3dprintboard.com/showthread.php?3105-Auto_Bed_Leveling-Enhanced-G29-command&p=61800&viewfull=1#post61800

3Dprintboard had some technical problems in April 2015. Many attachments posted prior to that no longer work. Nothing seems to be happening to fix the problem, so the attachments are likely lost. ...

Just a reminder to those struggling to obtain nirvana with a level bed - what the process does is adjust for variation in the distance between the nozzle and the print surface. The source of the...

Sure sounds like the 5V from the MEGA2560 board could be dropping out. Do you have another USB cable/computer to try or a powered USB hub to feed the USB through? Maybe the USB port on the computer...

AFAIK, all AVR MEGA chips are spec'd at -
Write/Erase Cycles:10,000 Flash/100,000 EEPROM