I would turn off smart setup as causing more problems than it helps
which version of hub do you have? have you tried selecting wireless channels manually instead of auto use a wifi analyser on phone to see which networks are near you and channels in use then select a free or less congested channel
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I have smart hub 1. I scanned local networks and there was one further away using channel 1, however on rescan the hub selected channel 6. I thought it was meant to do that automatically. I noticed that there are only about 4 choices for channels for the 5ghz band. Is this normal? I suppose it should be enough given the shorter range of 5ghz.