Nexus 4 keeps disconnecting from strong wifi network, and connects to the weaker one

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http://forum.xda-developers.com – I have two 5ghz networks. One, is two floors down (1 signal bar). The other, is about 30cm away from me (full signal bars) More often than not, if I unlock nexus 4.. it is connected to the wifi router two floors down (weak signal). I then manually connect it to the other router, which is 30cm away and do my thing. 20 minutes later, I unlock my phone again, and it's back connected to the router 2 floors down! I am having this issue on multiple different roms and kernels Any help? I've even selected 'avoid poor connections' but this doesn't make a difference! Thanks (HowTos)