It is suspiciously "rhythmical"...
Have you tried without the Eero and the Hub in normal router mode ?
What does the BQM look like then? Note you need a separate BQM setting up when hub is doing the routing as your ip changes.
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.