All google email sites reload every 7 seconds continuously. google does not have or won't tell an answer. Yahoo email does not do it. This problem just started without any computer changes.

If I can open five or six letters, sometimes the problem eases off after 20 minutes or so.

I would suggest running the network via a pc for the day.. pick either your Mac or win7 pc.. you will need to do a bit of fiddling.. even better would be to just borrow a router. Or buy one on a 7day return .. !! Beg borrow.. don't steal. Just get a router other than TC. it won't take long to determine if the TC is the issue.
IMO at 18months you are suffering failure of the TC power supply. early days but it is showing signs of delinquency. And will get worse. But another router will show it up.. if the PC has dual ethernet cards you can run ICS.. or same sort of thing on the imac to the wireless .. ie the PC or Mac becomes the router with direct connection to the cable modem. Then share internet from there.
Once you do that for a day or two, you will quickly be able to track down if the issue is cable service/modem or the TC as router.

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