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internet speed keeps dropping from blast to performance tier

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internet speed keeps dropping from blast to performance tier

I recently upgraded from performance to blast internet speeds and have had repeated problems with my speed dropping down to the lower tier. I have to call in about once a week and they fix my modems boot file and I'm back to the blast speeds. Is there any possible way my modem could be the problem or is this something wrong on Comcast's end that keeps kicking me back to the lower speed.