The native WiFi on this now several year old ThinkPad was a/b/g/n, so it could not take advantage of the ac router that came from Rise Broadband. I bought a TP-Link AC1200 USB WiFi adapter. It worked beautifully, often giving me the promise speed of 50 Mbps. A couple weeks ago, it started dropping connection after a few minutes, but it would reconnect just fine. Bad hardware? It turns out the properties tab on the WiFi devices under network devices has a checkbox for turning it off, apparently as part of power saving mode. I disabled that and everything is working fine again.
To me, this is just blindingly stupid.
UPDATE: Not that simple. This is a known problem. I cannot figure out which of the hundreds of sites I visited, but it told me what settings to change (some being power settings). Windows was dropping not just the TP-Link WiFi connection but the native WiFi as well. Problem solved. I remain convinced that a recent Windows 10 update is the cause.
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