Download speed constantly drops near night time.


For the past several months I've had an issue with my download speed constantly being reduced to around 5-7mbs while retaining the same upload speed. 

{edited for privacy}

The verizon speed test results are always irrelevant as my connection never reflects the same outcome that is displayed from their test as to (whenever my connection is fine shows correct results).  I've ran the verizon diagnostic tool and this is the out come result below. If anyone could please help me get an answer for this problem as I've had no help from verizon tech support to resolve this issue I'd appreciate it greatly. Thank you!

Analysis information:

WEB100 Enabled Statistics:
Checking for Middleboxes . . . . . . . . . . . . . . . . . .  Done
checking for firewalls . . . . . . . . . . . . . . . . . . .  Done
running 10s outbound test (client-to-server [C2S]) . . . . . 7.98Mb/s
running 10s inbound test (server-to-client [S2C]) . . . . . . 4.47Mb/s

	------  Client System Details  ------
OS data: Name = Windows 8, Architecture = x86, Version = 6.2
Java data: Vendor = Oracle Corporation, Version = 1.7.0_72

	------  Web100 Detailed Analysis  ------
45 Mbps T3/DS3 link found.
Link set to Full Duplex mode
Information: throughput is limited by other network traffic.
Good network cable(s) found
Normal duplex operation found.

Web100 reports the Round trip time = 20.3 msec; the Packet size = 1460 Bytes; and 
There were 90 packets retransmitted, 727 duplicate acks received, and 786 SACK blocks received
The connection was idle 0 seconds (0%) of the time
S2C throughput test: Packet queuing detected: 81.39%
This connection is sender limited 24.57% of the time.
This connection is network limited 74.67% of the time.

Web100 reports TCP negotiated the optional Performance Settings to: 
RFC 2018 Selective Acknowledgment: ON
RFC 896 Nagle Algorithm: ON
RFC 3168 Explicit Congestion Notification: OFF
RFC 1323 Time Stamping: OFF
RFC 1323 Window Scaling: ON
Current Send Buffer 255 Kbyte 
Current Receive Buffer 64 Kbyte 
Display Name = Microsoft ISATAP Adapter MTU = 1280
Display Name = Teredo Tunneling Pseudo-Interface MTU = 1280
Display Name = Realtek PCIe GBE Family Controller MTU = 1500

Server '' is not behind a firewall. [Connection to the ephemeral port was successful]
Client is probably behind a firewall. [Connection to the ephemeral port failed]
Packet size is preserved End-to-End
Information: Network Middlebox is modifying Window scaling option
Server IP addresses are preserved End-to-End
Information: Network Address Translation (NAT) box is modifying the Client's IP address
	Server says [{edited for privacy}] but Client says []
Re: Download speed constantly drops near night time.
Community Leader
Community Leader

Looks relevant to me.  It shows some sort of problem near you WITHIN the Verizon network or your home.

Tests elsewhere may depend on other networks and are normally ignored if you call Verizon about a speed problem.

You probably need to contact and give them the NDT output.