I have the same issue as you described.For instance when i played Modern warfare yesterday i had a very bad lag problem...today i couldnt even connect to a server.Everything else seems to be fine like netflix,youtube etc.I only use wi-fi connection to play online.Did you manage to solve your problem?
Modern Warfare servers had issues tonight worldwide
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Got sent a new router and that has fixed the issues.
Annoying since I spoke to one representative for over an hour who said they can't help and won't send out an engineer... The next guy I spoke to diagnosed the issue within 10 mins and suspected it was the router, got sent one the next day and voila...