Printer freezes randomly when printing.
I was using repetier firmware with my printer for like three weeks, then i installed a new heated bed and it worked flawlessly for three days and the started to freeze randomly when printing. i would press reset printer and it would say something like port COM3 is not responding, and when i would unplug and plug the usb port. when trying to connect it would just say: A device connected to the system is not functioning and the repetier firmware would just freeze too and not respond, but I see the printer regulating the temperature and looking just fine. it seemed like software problem, so I tried to print with pronterface and 30cm usb cable, it didn't help at all. I tried printing with different computer and the problem repeats. Can somebody help? I cannot print anything. I'm using Ramps 1.4 and Marlin 1.1.0-RC3.