I've got a 1st Gen Chromecast, a Google Home Mini, and a Pixel XL.
Sounds like this is my culprit. Finally.
Every time my phone has a connection hiccup it takes several minutes to renegotiate DHCP... But if I turn off WiFi and count to 15 and turn it on, it reconnects in 3 seconds flat.
I'm tempted to throw out my wifi gear but I'm having trouble who in the industry isn't total garbage, because I have an Asus AP that sure isn't helping.
"This is the single biggest reason we’re no longer recommending our former pick, the Archer C7. Though the C7 has great range and good single-device performance, it doesn’t have band steering, which means that it stumbles when several devices are connected and there’s a lot going on. The problem is compounded by the router’s relatively weak single-core CPU."
...our former pick, the Archer C7, leap all the way off the top of the chart into “oh, this is horrible” territory shortly past the 75th percentile — which means that roughly one out of every four page loads will leave you wondering if you should hit reload.