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I am at my wit's end with my Gigacube.
It gives under .5 of a meg all evening, only improving when reset, and even then only for under 30 minutes. When the SIM goes in my s20 it shows 15mb plus.
I've been onto support numerous times, the router is not fit for purpose, and as it came bundled in my contract, I believe I should be able to cancel without penalty.