Ok, magic information for you!
I found a solution to my streaming issue (streams would buffer for 10 seconds, play fine, then timeout for 10 seconds while the buffer re-filled)... Never happened with the Cisco DCP3010, the Arris SB6183 was terrible despite being a better modem.
Problem is buffer bloat (https://www.bufferbloat.net/projects/). Downloads would come in so fast that latency would go sky-high (2000ms ping response). Doing a little reading, I found some newer routers have a "fq_codel" feature (I'm running an ASUS AC1900 with Merlin custom firmware that has that feature.).
I enabled the fq_codel QOS, set my upload and download limits to 120 and 20 (close to what the limits are), and my bufferbloat issue almost entirely disappears. To test for it, use www.dslreports.com/speedtest -- Bufferbloat went from a "C" on my old cable modem to a B with the new one hooked up with the fq_codel QOS feature enabled!
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