If you know where abouts in the flat, sorry, apartment below the router is, try moving the computer so that it is physically closer to the router.
Also, do you know if it is set up for any particular wi-fi standard? Is your PC set up to use the same standard? Are you using a crowded wi-fi channel, default is channel 6 and if it's big block of fla.. apartments, if everyone is using channel 6 it can get unreliable.
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