What is the best way to get a large number of RNA seq data from SRA in Python without being denied access

I have the following code to download data from the SRA using multithreading in Python. After running this a few times now (for testing purposes), I keep getting denied access to the data. Not sure how to fix this. In particular, cating the output files gives:

<?xml version="1.0" encoding="UTF-8"?><Error><Code>AccessDenied</Code><Message>Access Denied</Message><RequestId>cb0f0e98-cafb-1dd7-9b7b-d8c49756ec52</RequestId><HostId>QeDGVwBXYp61J0B4_OUTn7UsEsiQEec0n18DAeR0kaE</HostId></Error>

Here is my code:

import threading
import requests
import time 

start = time.perf_counter()

class MyThread(threading.Thread):
    def __init__(self, url):
        threading.Thread.__init__(self)
        self.url = url
        self.result = None
        self.filename = url.split('/')[-1]
    def run(self):
        res = requests.get(self.url)
        with open(self.filename, 'wb') as f:
            f.write(res.content)
urls = [
        'https://sra-downloadb.be-md.ncbi.nlm.nih.gov/sos1/sra-pub-run-1/SRR000001/SRR000001.1',
        'https://sra-downloadb.be-md.ncbi.nlm.nih.gov/sos1/sra-pub-run-1/SRR000001/SRR000001.2',
        'https://sra-downloadb.be-md.ncbi.nlm.nih.gov/sos1/sra-pub-run-1/SRR000002/SRR000002.1',
        'https://sra-downloadb.be-md.ncbi.nlm.nih.gov/sos1/sra-pub-run-1/SRR000002/SRR000002.2']

threads = [MyThread(url, ) for url in urls]
for thread in threads:
    thread.start()
for thread in threads:
    thread.join()

finish = time.perf_counter()

print(f'Finished in {round(finish-start, 2)} second(s)')