I thought it was the cable modem but for a year or more randomly I will get a amber light on my airport extreme. it is the last gen before the shape changed. the 4th? or 5th. anyway it has been updated and it has done this for most of the time I had it. in the evening between maybe 7 and 9 I will get the amber light loose wifi and I think wired connection for maybe 20 seconds or so. then the green comes on and off we go. sometimes my older iPad will need to have the wifi turned off and on again to get it upto speed. this happens randomly sometimes overnight sometimes a week between. but pretty much only in the evening.