According to the search results, "champagne problems" can refer to two different things:
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A song by Taylor Swift, which is a lo-fi ballad written from the perspective of a troubled girlfriend who turns down her lovers earnest marriage proposal due to her not feeling ready. The song depicts the narrator taking responsibility for the breakup and mourning the faded relationship. It is built around a guitar riff and oom-pah piano.
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An idiom that generally means easy problems that you don't have to worry about; such difficulties are trivial compared to issues of poverty, national disasters, and war, but nonetheless provide individuals with something to complain about.
Therefore, the meaning of "champagne problems" depends on the context in which it is used.
