Why does my noise margin start off at 6.3dB then d...

Basically every time my modem is reset, the noise margin is 6.3dB and then after that, each day it drops off another 0.1-0.3 until it gets to 5.4dB why is that ? Obviously The reason I ask is, if it gets too low it will reset my modem by itself won't it? Could the modem be the reason.

this is what i mean guys, i know that one of them is 5.9 and the others 5.8 but why is there so much of a difference 
non interleaved- http://gyazo.com/40d6ce989f2e6aad93e2ac53d0391fb5
interleaved- http://gyazo.com/ed752dd4dd109e63c72aea0357209b68
these are also pretty close and look at the difference
interleaved- http://gyazo.com/ee5da83220e8fc541577eee19fee26a1
non interleaved- http://gyazo.com/986ee7fafc206a50d368afbeda9150b9
the bottom two are slightly different but why such a big gap? 
why when none interleaved the max is a lot lower? 
if my sync speed is lower then why does my noise margin not increase rather than decrease and not rise back up?

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