personally I would swap out the router. Since the ISP says that the line isnt dirty and I wouldnt think its the cabling since its all 4 pc. If it was the cabling I would suggest swapping the cable from the router to the switch. also you might want to axe the switch and plug all the PC's to the back of the router and see if youre still dropping packets.
IMO I would say the router or switch.
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