I have a TP-Link AC1200 Dual Band Router.
Results of the tracert:
Tracing route to youtube.com [172.217.15.78]
over a maximum of 30 hops:
1 2 ms 2 ms 2 ms 192.168.0.1
2 29 ms 14 ms 13 ms 10.14.128.1
3 14 ms 21 ms 13 ms 100.127.41.146
4 15 ms 17 ms 14 ms 100.120.124.20
5 24 ms 36 ms 61 ms ashbbprj01-ae2.rd.as.cox.net [68.1.0.242]
6 24 ms 138 ms 75 ms 98.182.1.86
7 82 ms 1380 ms 135 ms 108.170.246.33
8 143 ms 102 ms 218 ms 74.125.252.39
9 955 ms 155 ms 306 ms iad23s63-in-f14.1e100.net [172.217.15.78]
Trace complete.
Probably an issue with your modem then. Based on how good your router is compared to what the modem provides I would have set the modem to bridge mode and used the wireless router for everything else.
Anyways, get with Cox and see if you can swap out your current modem for an Arris TM3402 eMTA. A Cox employee posted on dslreports.com forum that as of 10/01/2018 the TM3402 is available to everyone on all tiers. This modem was previously only available on the Gigablast tier.
