Comcast told me it was becuase our modem was outdated. Needed 6-series something; had 5. Lost internet several times until I finally bit the bullet and installed 6 series. Now working faster than ever and seems stable.
the 5 series modem was only 2 y/o. They "sent the signal" and it came up a couple of times using the old modem, but it would fail a few days later.
BTW, we BOUGHT the new modem. They'll be happy to RENT you one. Hmmm.
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