Unresolved Robo 3D R1 Connection lost

I recently started a 30 hour print and after about 25 hours, the print stopped and said the connection was lost. I thought the USB cable just got messed up but after starting the print again, it continued to disconnect, and began saying "Connection Lost - A device attached to the system is not functioning". Is this a problem with the USB cable, or is something else causing the problem? I have had the printer for almost a year now, and have usually been able to fix connection problems just by unplugging and plugging it back in or restarting matter hackers, but this time it consistently gives me the same error shortly after starting a print. I really hope this isn't my printer breaking down from all the use its been through. I would greatly appreciate any help!

 

I have my computer set up so that it never shuts down while printing and it would disconnect while I was watching its progress on the computer. I have done similarly long prints before without any problem and have just recently been getting the "device attached to the system is not functioning".

 

SD card printing is far more reliable. If you have or get an LCD controller, then you can easily do this. The other option is to use Matter Control to start the print from the built in Robo sd slot. You can then remove the USB and take that out of the equation.