Another possibility: USB-3 proliferation and inadequate shielding. Many 3 devices spew so much 2.4ghz noise that it interferes with wifi, much less lower power

Another possibility: USB-3 proliferation and inadequate shielding. Many 3 devices spew so much 2.4ghz noise that it interferes with wifi, much less lower power protocols. Unless you mean it degraded on the same device.