Welcome, ASUS DSL-N16 can encourage changes in the SNR, so maybe worth increasing to say 15dB to see if that helps with stability.
Usually stability / errors is caused on the Downstream connection, what is your SNR for Downstream ?
Alas this will have the effect of lowering you synch rate (speed) so there is always a compromise.
Screen dump of your DSL stats page would be helpful 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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