Glad that worked for you but...
5Ghz band is not a slam dunk for everyone, it's situation dependent. If there are a bunch of walls/floors and distance between the client and the access point, 5ghz will usually end up worse *unless* you have a really bad congestion/interference problem in the 2.4ghz band.
So anybody reading this, don't assume that your best experience is going to be on 5ghz - it's worth trying both, if you absolutely must use wifi. Getting wired really is worth it.