Star TSP100 printers - sudden connection issues seemingly tied to the print queue
Yesterday, the printers for our POS system stopped working properly. We have two Square Stands with iPads, connected via USB to two Star TSP100 (TSP100II) printers, and both started exhibiting this behavior at the same time. The printers will sometimes print the current receipt, and sometimes they won't. If a receipt is printed successfully, the printer will reprint that specific receipt roughly every two minutes for the next ten minutes or so.
It seems to be an issue with the print queue not clearing properly, but I've tried everything without success. I have assigned different printer profiles to the printers, deleted every stored printer profile and created new ones, hard reset both printers, uninstalled and reinstalled Square on our iPads, and left all of the hardware unplugged and off overnight last night.
We're able to maintain operations, but this is an enormous headache if a customer needs a receipt, and an enormous waste of receipt paper. The fact that it happened suddenly and to both printers simultaneously makes me think it's a buggy update to the Square POS app, but I don't have any concrete proof of that.
I only saw a hardware error displayed on the screen once, and that was (SPSHardwareErrorDomain error 15)