Huge System Slowdown/No networking?

Hi,
This is a very strange problem, that has been bothering me for a few weeks now.
Sometimes, my networking will suddenly cut out - the AirPort menu sees no network, when there should be at least 3. When this happens, there is also a huge system slow down - Activity Monitor shows "kernel_task" as using about 60-70% of the CPU - for the duration that the AirPort is turned on.
This problem can only be rectified by restarting.
Any ideas?

This has happened again...
Also a new issue: the trackpad will stop working on a wake from sleep. Rectified only be restarting...

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