How do I prevent my Linux service (Ubuntu 16.04.5 LTS) from restarting when using loops that run in the background? - linux

Question

So I have a script setup that I want to run as a service. The script runs 8 curl commands continuously forever:
#!/bin/bash
threads=8
check_interval=15
batch_url=https://myurl.com
for ((i = 0 ; i < threads ; i++)); do
sleep $i
while true; do
sleep 0.5
has_items=$(curl --silent -m 15.0 --connect-timeout 1.5 $batch_url/$i)
if [ "$has_items" == "false" ]; then
sleep ${check_interval}
continue
fi
done &
done
I have a service file setup in systemd that looks like:
[Unit]
Description=Run the batch forever
After=network.target
[Service]
Type=simple
Restart=always
RestartSec=1
ExecStart=/bin/bash /usr/bin/my_script_location
[Install]
WantedBy=multi-user.target
If I simply run the script it works fine. It loops forever pinging URLs /0 through /7 forever.
However, if I set it up as a service, the service will restart after some time.
I believe the issue is related to having the while loop run in the background, but not sure how to make the service work with this. It's possible that the service approach is the wrong method. I simply need this script to always remain running.