Lag and dropped packets

Hi,

Several times each day there is a short period of time, usually about 5 minutes or so, when I experience lag times of 2-5 seconds and dropped packets getting to the Internet. I have monitored the connection using ORB and I have screenshots of this activity. I am using a Motorola SB6120 DOCSIS 3.0 cable modem hardwired to an ASUS AC-1750 router. Whenever this occurs the delay is always between the Router and the Internet. Any advice about how to figure this out would be appreciated. Here is an example: