Ok, so I have heard back from ASUS today and they are pulling Firmware 3.0.0.4.386.37589 after the recent concerns with ethernet / LAN ports connections not working after upgrade.
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After evaluation, we decided to revert back to earlier stable official release v3.0.0.4.384_81981. Later v3.0.0.4.386_37589 will be removed from support site.
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Downgrade I believe can either be achieved via routers UI, router app or manually 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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