This sort of error that happens out of the blue like that tends to be related to the Database, so the only thing here that I could think of would be that your global $wp_rewrite got messed up by some plugin on something.
Try to refresh your permalinks by going to the admin page: “Settings” > “Permalinks” and hitting save, I think this might solve your problem.
If not provide us with the output you are getting on the get_term_link method.
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