Zymkey - concurrent SSL requests

We are using zymkey as SSL engine for curl to make HTTPS requests (with the flag --engine zymkey_ssl). It worked nicely at low volume but starts to fail when we have a lot of concurrent requests.

curl: (66) Failed to initialise SSL Engine 'zymkey_ssl':
9|tester  | error:2506406A:DSO support routines:dlfcn_bind_func:could not bind to the requested symbol name

Is it a known limitation of the hardware/driver?

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Can you quantify “a lot concurrent requests”. Thanks

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around 5-20 requests per second