Grawrie

I've been testing using 1 to 2 hour prints, which really isn't long I don't think. I've had it die around the 20minute mark too.

Sorry, I'm a complete newbie with all of this, but I've been trying to fix my 3D printer with what little knowledge I have. As the title suggests, the printer stops printing at random times - it's not at a fixed location in the entire Gcode. I'm using Repetier in combination with Cura and also unfortunately a USB connector instead SD card (i'm just waiting for the materials for that to come in to add that stuff). From, what I've found online, people have generally been saying it's because of the thermistor or the fact that it's a USB connetion. I don't think it'd have to do with the thermistor simply because if the thermistor malfunctioned, at least there'd be some sort of error message in the feedback log (I'm having the printer echo everything back while it prints). The Arduino shouldn't be overheating either; there's a fan blowing at it the entire time it's on. Like I said earlier, it stops printing randomly with no set location on the Gcode. It just stops and and the feedback log just sits there blinking, as if it's waiting to report something new which makes me think this whole problem has to do with a loss in the connection. And so I'm thinking it has to do with the fact that it's a USB connection. Would it be wrong to assume the problem stems from the USB connection or could there be something else that's the source of the problem? If it is the problem, how do I fix it, besides changing it to a using a SD card?