Welcome to HAN! I am currently on my 4th radiator. It's come to the point where I can do a rad install and coolant flush in 15 minutes!

If you keep getting the OEM replacements make sure they do not come with plastic endtanks like the OEM rad is equipped with. they are weak and especially on a GSR will have problems. also check to make sure the rad cap (probably cheap) isn't leaking or failed. Metal endtanks are best, and unless you are a building a monster engine, you do not need a Fluidyne.