Constant evening packet loss

Every single night in my area (Fairview Heights in Portsmouth, Virginia) there is extreme packet loss. I have recently upgraded my router to see if that would make a difference and so far it has not. I will be upgrading my modem soon as well but somehow I don't think this will help much either. During the day and afternoon everything is fine. It is only once the evening hours of around 8 PM - 12 AM EST arrive does the issue happen as well. Is there a known issue in this area? It's been going on for months now. I have posted my modem signals to this forum twice this year and been told everything looks fine. I can only assume it's an issue with the lines or a nearby node.