Thanks uberjon and x720I agree. Your channel might be set to 'Auto' which in some rare cases, might be Channel 13 or even 14. Try manually setting the channel to 1 or 6 or 11.
Now please don't ask the dreaded question 'How do I change my channel?'![]()
Issue resolved (hopefully) by setting channel to fixed number rather than using auto option in router wifi settings.
Interesting aspect is my phone, which is also samsung (s4) and laptop had no issues.