Help assessing audio and network connection issues (jitter)

Shadow has been working flawlessly for the last month or so for me. However just a day or two ago the audio started crackling and sounding like static... I reached out to shadow support and they suggested me running a speed test to the datacenter (Chicago) to assess the connection. My results kind of concern and confuse me - can anyone explain to me what might be causing my connection to behave erratically like the speedtest results below show (all taken within minutes of eachother)?

To be clear right now i'm not necessarily trying to solve the audio crackling problem, I'm trying to figure out what is going on with my connection. Shadow suggested that the Jitter is the concern.

Background: I use the Eero mesh router network, hard wired into the gateway router, i've reset the router, I use spectrum internet 200 mbps download, and I'm about 40 miles from the shadow datacenter.

Test 1:

Latency -18, Jitter - 6, MBPS - 100

Test 2:

Latency - 30, Jitter - 50 (spiked to 200), MBPS - 75

Test 3:

Latency - 18, Jitter - 5, MBPS - 60

Test 4:

Latency - 20, Jitter - 40 (spiked to 200), MBPS - 75

Test 5:

Latency - 17, Jitter - 4, MBPS - 50

Thank you!