How do you stall technological advance

So I've been thinking a bit about this lately and wanted to get your ideas on it.  What factors, influences, and/or conditions would work to limit the rate of technological advance of a modern (already technological) society over long timescales (i.e. decades/centuries).  What could cause the technology to remain relatively stagnant for decades?  I have some ideas and want to hear yours.  Chime in below.

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