I aggree with you that t's likely a severely congested link you are being routed through. 8-10 PM fits in with that generic time where family members are going to have fired up their favorite streaming video source(s). Since it's a congested link, you also should be aware that ICMP (what ping and traceroute use) become nearly useless for determining packet loss. A router backplane assigns a grade to every packet that wants to cross from one network connection to another, and ICMP typically is assigned low grade/value. So when a router is congested and needing to drop packets, ICMP is one of the first ones to get dropped. Less than 1% of your TCP traffic may be having problems, but ICMP failure might be greater than 50%. Find a traceroute program that can use TCP to do the traceroute for more accurate results. I'm not a Windows guy, so I have no clue what programs you have which can do this.
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