I'm with Talktalk and about 4pm the internet start buffering on and off until I give up around about now. Can I change to another server and will it be better. Any advice appreciated. 
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Last night our tele in the kitchen kept pixelating ... it's fine this morning. Therefore my advice is don't do anything and it will sort itself out.
Kindof my philosophy on life really
what speed is your broadband ?
I have a lot of buffering but am on a very slow/low broadband speed owing to where I live and know who ever I go with I will have the problem however give TalkTalk a ring and tell them as like my provider they can tweek from their end to ensure you are getting the best through the line provided by BT .... hope this makes sense 
Don't ask me but the sun is shining if that helps
4pm is school out time and people coming home from work so everyone is getting online. .ask neighbours who they use. .if a lot are all using the same provider it will slow down when everyone is at home..
Try using cable if they supply your area. .really fast speeds.. also check your contract, do they limit your usage and state at certain times speeds will be slower?
Shop around but cable is best for speed afaik even with heavy usage in an area..phone line internet access [adsl] is the worst for slower speeds in my experience..