iperf3 tests for packet loss udp

Hello, I'm trying to measure packet loss on a T1 circuit. I'm doing iPerf3 tests. version 3.1.3. A noob at iperf.

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I enter the following commands for client server:

iperf3 -c 172.28.28.2 -i 1 -V -u -b 1.4M

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iperf3 -s -V

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1 time I do the test it gives me 10% packet loss, another time 60% packet loss. No matter what T1 circuit I do it on, it always gives me wonky answers for packet loss that vary all over the place. Is my syntax correct here? Do I need to add more to get more accurate results? I'm trying to get the tests right so I can use this on a regular basis to measure packet loss on our T1s.