could try edging and/or going slower to build up more, but i don’t think these are common reactions. most people will not experience that no matter what they do. some people are blessed with being easy, including zero refractory period. wired for hedonism, if you will.
unless we’re talking about some kind of self made ice toy, a good toy also should not melt. you could probably dent or even misshape silicone by mashing it too hard, but that’s physically inflicted damage and not a flaw in the construction.
Oh, look at dr. Orgasm over here! Why don’t you just come over and fuck me yourself if you’re such an expert, huh?