Ok, I've been way too busy to deal with this but thanks for the follow-ups everyone.
Anyway, to answer your questions, smackie:
Make/model number of the modem.
Make/Model number of the wireless router.
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Arris Interactive, L.L.C. TG862G
Make/model number of devices that can't connect consistently.
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It's basically everything we have:
Xbox
HP Pavillion g series laptop
Apple iPhone 4S 16GB
Motorola DROID RAZR MAXX
Kindle Fire
Sony Network Media Play SMP-N200 (two of them)
Do you have any wireless devices that can connect consistently?
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Generally they do...but when the connect dips, they all seem to dip together.
Do you have any wired devices that suffer from inconsistent connection, or is it just the wireless devices?
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Seems they generally work pretty well...but of course, we're not on them all day long connected to our home wireless network. Generally, we notice the issue with connectivity in the evening, after the kids are in bed (9ish or so) when we finally get to unwind and watch something on Hulu/Netflix, it can go anywhere from 11 - 15 mbps to under 2 (the Sony player seems to always be lowest...around .02 mbps when the dips occur).
Nothing else seems to be on the same channel, and using Meraki's Wifi Stumbler, I'm almost always seeing 100% connection.
The modem/wireless signal is located on the ground floor, with devices on the top floor and basement. Again, normally they're fine...but these downward dips happen and everything crawls. And even when the modem was a few feet from one of the Sony devices (the one we use the most in the bedroom), the same thing would happen.
And are they plugged into the wireless router or ports on the modem?
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None are plugged directly to it...in the central location that it's located, nothing is really close enough to directly connect, but I could certainly try that. When we had Verizon months ago, they had me test a direct connection and it worked when the dips where occuring in the wireless signal.
I feel there HAS to be something interfering, but I have no clue how to find it.