When the company delivers its Q3 report, it could be a make-or-break moment.Undoubtedly, Palantir Technologies' (PLTR 1.44%) stock performance is starting to cool off a bit. The stock was the biggest gainer in the S&P 500 last year, rising by an incredible 340%. But now there are serious concerns about its lofty valuation, and the federal government shutdown -- which as of this writing shows no sign of ending -- could also cause issues for the company.Palantir stock is still beating the market, up 33% in th ...