probably because they used crappy lead solder, lead solder has low melting point as opposed to silver solder which has a high melting point, the problem stims form using low quality high temp solder so i don't see how using lead solder is gonna help.
That said weather you reball or re flow you have to modify the cooling system other wise it's just gonna happen again. I drilled some holes with a paddle bit and JB welded in some modders mesh under the fan and stuck some adhesive backed case feet under the existing case feet, all in an effort to give it more air flow, I haven't had any returned since with the exception of one and it hasn't not returned for a 3rd.
That said weather you reball or re flow you have to modify the cooling system other wise it's just gonna happen again. I drilled some holes with a paddle bit and JB welded in some modders mesh under the fan and stuck some adhesive backed case feet under the existing case feet, all in an effort to give it more air flow, I haven't had any returned since with the exception of one and it hasn't not returned for a 3rd.












