Intermittent Packet Loss - Worst at Night and Early Morning

From midnight it gets to be the worst, from 2-4 AM i have complete interruption of service as well. Dont get me wrong, there is no good time but pointing out its worse at night. Is there any reason why someone would experience more packet loss late at night than during the afternoon? Shaw says my line signals are not at optimal levels and will come take a look, but i'm not the only one of my friends with this issue. I also see someone in BC has the problem on here. Any local fixes i can try in the mean time?