How to 'fix' a constantly breaking label printer?

Hey. I work for an MSP who has a customer that uses thermal label printers on two different sites (one on each) which are constantly having issues. Both sites are domainless and the printers are being shared out via a usb connection to a users workstation. Both printers are this model and are printing on average a label every 5 minutes. At the moment we are getting calls daily about the label printer not working which we are fixing via restarting the spooler service or re-inputting the local credentials when the error is 'access denied'. Due to an application the company uses, the printers on both sites have to be the same model and they only got one of the printers recently so they will be hesitant to buy new ones already. Anyone have any suggestions on what we can do to negate the problems or is it just a case of dealing with it? Thanks.