Zendesk API Incremental Export Tickets Error: upstream connect error or disconnect/reset before headers. reset reason: connection termination

I'm getting this error for weeks now and but so far, I can't see any solutions here

upstream connect error or disconnect/reset before headers. reset reason: connection termination

GET f'https://{subdomain}.zendesk.com/api/v2/channels/voice/history/calls.json?from={start_time}&to={end_time}&per_page=500'

Any idea how to fix this?