To solve the problem with wireless reconnects try to adjust smp affinity
for your card.

1. Get IRQ number in the first column in /proc/interrupts for wlan or ra device
  
   $ cat /proc/interrupts | egrep "wlan|ra"

2. Dedicate our first CPU (CPU0) to handling the card interrupts

   $ echo 1 > /proc/irq/ < IRQ > /smp_affinity


ps. must have uninstalled a irqbalance package

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https://bugs.launchpad.net/bugs/689960

Title:
  RaLink RT3090 wireless reconnects

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