Hi Remy,
It doesn't appear to be the modem. The replacement arrived Friday. I installed it Sunday morning after running 40 hourly automatic speed tests with the old modem.
The old modem test began Friday afternoon 6/23 at 1:21 pm and ended Sunday morning 6/25 at 4:43 am.
The new modem test of 50 hourlies began Sunday morning 6/25 at 7:49 am and ended today at 9:22 am today.
It looks like the new modem did a high download of 46.4 Mbps at 4:25 am 6/27 and a low of 0.69 at 9:19 pm on 6/26. The high upload was 3.11 at 11:07 am on 6/26. The low was 0.26 at 10:53 pm on 6/25.
The old modem did a high download of 41.59 Mbps at 1:29 am on 6/24 and a low of 1.8 at 7:39 pm on Saturday. The high upload of 3.35 was at 2:30 am on 6/24. The low was 0.33 at 1:35 pm Saturday.
None of these tests appear to be influenced by weather. At least on my end.
We had some quick thunderstorms come through Sunday and again after midnight for a few hours. You can see the hit on upload speeds during some of the late storms that coincided with a speed test but they didn't appear to bother the downloads all that much.
The modem had a rough time doing a software update Sunday. It stuck on the dreaded 15 signal for quite a while doing that IPGW pool thing when trying to associate.
Thanks,
GW