Connectivity issues in Cherry Hills Village Colorado

For some weeks we've been experiencing increasing bouts of dropped packets. Rebooting the cable modem doesn't seem to change anything.

Cable Stats:

Downstream Channel

Upstream Channel

using google.com as a ping partner, I see times ranging from 10ms to 40ms and dropped packets up to 50%. My traceroute output follows. There are no Windows systems permitted on our network (other than virtual machines which are not active and/or not connected past their host during these events). There is no obvious time of day or weather pattern involved.

traceroute google.com

traceroute to google.com (216.58.217.32), 64 hops max, 52 byte packets

1  10.1.10.1 (10.1.10.1)  1.127 ms  0.827 ms  1.213 ms

2  c-67-161-142-1.hsd1.co.comcast.net (67.161.142.1)  1166.861 ms  9.339 ms  8.557 ms

3  162.151.38.193 (162.151.38.193)  10.628 ms  8.695 ms  9.618 ms

4  ae-22-0-ar01.denver.co.denver.comcast.net (68.86.179.237)  34.850 ms  10.649 ms *

5  * 68.86.166.73 (68.86.166.73)  12.414 ms

    he-6-1-1-cr01.1601milehigh.co.ibone.comcast.net (68.86.87.117)  10.031 ms

6  he-3-8-0-0-cr01.denver.co.ibone.comcast.net (68.86.85.185)  15.922 ms  12.549 ms

    he-0-5-0-0-cr01.denver.co.ibone.comcast.net (68.86.86.189)  12.844 ms

7  * 68.86.85.150 (68.86.85.150)  29.009 ms  19.216 ms

8  as15169-1-c.910fifteenth.co.ibone.comcast.net (23.30.206.106)  11.999 ms  9.779 ms  11.850 ms

9  72.14.234.57 (72.14.234.57)  12.114 ms  12.040 ms  11.226 ms

10  209.85.250.255 (209.85.250.255)  12.841 ms  11.980 ms  13.260 ms

11  den03s10-in-f0.1e100.net (216.58.217.32)  20.829 ms  12.289 ms  11.660 ms

... sample ping

--- google.com ping statistics ---

37 packets transmitted, 21 packets received, 43.2% packet loss

round-trip min/avg/max/stddev = 10.724/19.875/57.667/11.623 ms

---> this results in poor voice (skype, facetime, hardware voip, etc.) as well as making it nearly impossible to download ISO images.

Suggestions?