Had this since I bought my MacBook in 2008. At Uni it would take fiddling with the wireless to get it to connect despite it reporting strong signal. Other times it would forget passwords.
When I got my Airport Extreme it stopped doing it for a while (!) but now I'm on a HH5 it's back again. Strong signal reported, but won't connect without some considerable persistence on my part.
I find my iPhones have always been (sort of) the same, it can report full signal yet won't load any pages and struggles to attain an IP.
I just learnt to live with it tbh.
When I got my Airport Extreme it stopped doing it for a while (!) but now I'm on a HH5 it's back again. Strong signal reported, but won't connect without some considerable persistence on my part.
I find my iPhones have always been (sort of) the same, it can report full signal yet won't load any pages and struggles to attain an IP.
I just learnt to live with it tbh.