Okay then:
TP-Link Deco M5 here, 4 units total. Used as main network router. Local ISP via dedicated 60GHz link, 500/500Mbps.
Working setup with 3.3.5: Smart Lock connected to main SSID, mesh allowed.
Issues begun just after update to 3.4.9. Tried so far:
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Disable mesh for Smart Lock, set preferred mode to 2.4GHz and isolate to single nearest AP
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Move Smart Lock to guest SSID (2.4GHz only)
None of the 1) or 2) helped. I’m able to connect Smart Lock to WiFi, Smart Lock looses connection within few minutes. As far as I understand, 3.3.5 was stable release (no beta) so I’m confused why beta-quality 3.4.9 was installed on my Smart Lock as I never have joined beta-test program.