I have built a POS System with two computers connected to eaching using "Homegroup". One computer ( has one receipt printer for local printing while the other (A) has four printers connected to it, all via USB ports. For the longest time, I am able to print from Computer B to all printers connected to Computer A with no issues, but just recently, one printer keeps dropping off. Computer A still prints to that printer fine, but from Computer B's perspective, the printer cease to exist. I have to "Add printer" every so often. Does anyone have any ideas on what's going on here?