I think it would be the sockets, rather then the globes themselves. They run a fair amount of current and the terminals will get hot and go black if they are not connecting properly.
Another idea. Jaycar Electronics have LED replacements for halogen downlights. They have taken high-brightness LEDS and put them into a down-light housing. Should be fairly bright and use less current. They are expensive, but you should only have to put them in once. LED's should last virtually forever.
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