Received and proceed the upgrade on Monday but the speed still inconsistent sometimes lower than previous speed. Are they still upgrading as they said they are going to contact in 6 days but so far no call from them. I am upgrading from 20mb upgrading t0 300mb. Yesterday can go 80mbs only and today worst... 5 mbs only

I have upgraded my wifi router to Archer AC750 C2 since day 1 and i don't think that i have to upgrade it again as the capacity is 300mb and 450mb (5GHz).

Anyone got the same problem or am i missing something here?