These setup instructions for the Star TSP800 Rx printers are working for me. I can print multiple Rx's, no problems with font size, etc. Remember that there are two models, the original TSP800 & the TSP800II . Each has its own driver install program; located at this Star support site. Amazingly, the Win 7/Vista drivers for the TSP800 still work with Win 10 (HP certainly can't claim that for an over 10 year old printer).

Some of the loss of connectivity, difficulty printing multiple pages, micro font sizes and other problems mentioned could be wrong drivers or incorrect configuration.

John
Internal Medicine