My second day of testing the solution @frostschutz proposed -- activating developer mode by searching for "devmodeon" and then selecting "Force Wifi on" -- seems to have cleared up my difficulties. I shall continue to test, but the difference in responsiveness is huge, and I have had no crashes or lockups since.
I've passed this information on to the Kobo developers with this note: "What changed between 4.30 and 4.31 in the handling of Wi-Fi? And can that change be rolled back in the next release, please?"
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