I'm giving your resolution as an answer so that it will help the community to find better solution.
Issue:
customer facing was issue in the version 5.45.8999.1 with error NpgsqlTypes.NpgsqlInterval,
switching back to version 5.48.9106.2 getting know error but experiencing slowness in copy activity.
Solution:
Found that version 5.48.9106.2 is working fine and issue is related to network
however, it is recommended use the latest version 5.52.9222.3
Know more about Troubleshoot copy activity on Self-hosted IR
and check this link for latest version IntegrationRuntime_5.52.9222.3.msi
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If you have any other questions or still running into more issues, let me know in the "comments" and I would be happy to help you.