I have been using Oanda now just over two months, and have had no probs other than the server being down a couple times (One of those being a couple of hours back ).
I also understand how their spreads differ at different times of day and on weekends. Perhaps its just me, but it appears the last 3 or 4 Thursdays, their spreads are near weekend rates...
The liquidity in the market appears to be normal if not a tiny bit higher. They state the real reason their spreads change is because of low liquidity or news release.
So why are they so large NOW?
GBP/JPY-15
GBP/USD-10
NZD/USD-20

Simply to name a couple...