Sporadic 500 Error from /files/search_v2

I'm getting 500 errors from the /files/search_v2 API, and I'm not able to figure out why.  It happens sporadically, and maybe when I'm making several calls back-to-back, but I'm not 100% sure there's a relationship there.

 

Here is the response header for one of my failed requests.  Any idea what I might be missing?

 

X-Frame-Options=[DENY], null=[HTTP/1.1 500 Internal Server Error], X-Envoy-Upstream-Service-Time=[223], X-Dropbox-Request-Id=[6844e73232f37e185e4d7e11d8102acc], Server=[nginx], X-Content-Type-Options=[nosniff], Content-Disposition=[attachment; filename='error'], Content-Security-Policy=[sandbox; frame-ancestors 'none'], Connection=[keep-alive], Content-Length=[0], Date=[Tue, 23 Jun 2020 20:45:45 GMT], Content-Type=[text/plain; charset=utf-8