only AiProtection is active Firmware Version:3.0.0.4.386_42438 (3.0.0.4.386_42438-g045583a)
When you have time, could you disable AiProtection and re-boot rooter, just to see if AiProtection is causing problem, After re-boot, leave router with AiProtection Off for 1 hour, then if memory usage is lower 70-80% then we know AiProtection is problem and I can inform ASUS 
After test, re-enable AiProtection if you wish and did the RAM usage increase over time ?
In a completely sane world, madness is the only freedom (J.G.Ballard).
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