I've got an iPhone 5 that gets little no no wifi signal. The only time I get 3 bars is when I sit it on too of my router. I replaced the wifi antenna 2 times now and it still isn't resolved. It went from no signal to some after the first replacement. No change after the second. Anyone have any thoughts? I've tried restoring it already. I'm thinking about reflowing the wifi chip but am unsure which one it is.