Slow requests for following dataset: Seasonal forecast monthly statistics on pressure levels

Datasets and Usage C3S - Datasets and Usage
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Hi everyone, I am facing one issue regarding seas5 pressure level dataset.

Since I am building the historical dataset, I am sending requests regarding all the months and years I need to get. First I did it for seas5 single-levels and everything worked smoothly.

But for pressure levels variables the first request is usually super fast: 1-3 minutes and gets stored in the s3 for me. The moment I try to make the second request, it takes about 40 minutes and since I am using aws lambda it gives me a timeout even before data is available.

Could someone point out what could I be doing wrong? I will paste the request for further reference

request = {
    "originating_centre": "ecmwf",
    "system": "51",
    "variable": [
        "geopotential",
        "temperature",
        "u_component_of_wind",
        "v_component_of_wind"
    ],
    "pressure_level": [
        "10", "50", "200",
        "500", "850"
    ],
    "year": ["2019"],
    "month": ["03"],
    "leadtime_month": [
        "1",
        "2",
        "3",
        "4",
        "5",
        "6"
    ],
    "data_format": "netcdf",
    "product_type": [
        "ensemble_mean",
        "hindcast_climate_mean",
        "monthly_mean"
    ]
}