I have noticed that my connection seems to be dropping allot over the last week. When my router reconnects I seem to have problems connecting to 'Goggle' (which is set as my home page) but am able to connect to other sites without a problem. To resolve this I have to restart the computer.
The best advice I could give would be to try clearing out your browser cache, just to ensure that this isn't causing you any problems. After this, try setting your DNS settings on the computer so that they always use two of ours, as its possible that your machine isn't picking DNS details up straight away.