Bulk call to prospect seems to hang after 30 Iterations #203

I'm using the "api/prospect/version/4/do/query"

with
id_greater_than
id_less_than
format = json
output = bulk

After 30 iterations of 200 records the 31st call seems to hang, I'm not getting an error or a timeout (also my API Key has not expired). Are there any know issues around this? Has anyone else experienced anything similar? I'm not seeing a similar issue when using ''"api/visitor/version/4/do/query"