I had a weird problem with the wireless led blinking at something like 10Hz, with the card turning on and off at the same rate (resulting in very very very bad connection and sometimes CPU 100% to process ACPI events).
It took 30min to take the whole laptop apart (list of sony service manuals) and then it turned out to be a loose screw that was causing the hardware switch to "bounce". Tightened it and it's all good.
There is also now 1 less screw inside my laptop.
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