upgraded modem to sb6141- initially fast but now extremely slow

I ordered the Motorola SB6141 modem to take advantage of DOCSIS 3.0 since I have the preferred package. It only took 20 minutes with Cox support to set it up which was great. I hopped over to speedtest.net during the call and I was getting 32 Mbps which was a big improvement from the 15 Mbps I was getting with my old modem

I was thoroughly impressed until about 20 minutes later the internet was crawling. I went back to speedtest and the tests are struggling to get above 4 Mbps. I noticed my account says I have a RGI6141 on the My Services page but not sure if that is related. The firmware is SB_KOMODO-1.0.6.12-SCM00-NOSH.