I’m having the same issue, but slightly different. I’ll occasionally get the white pages thing, but if I do nothing…the pages come back in about 4-5 minutes. It seems to be in correlation to the garbage collection and expired files timeframe. I’ll keep track, but every time the pages come back, it seems as though garbage collection and expired files were just cleaned a minute or two before. For now, I have set expiration to 86400 (a day). We’ll see how that works.