Cash Account APY Cut

Hi all. I'm new to Wealthfront and I opened a cash account with a 0.5% boost referral code about a week ago. Then my rate got cut by 0.25% like a day or two after opening the account. For those who've stuck with Wealthfront for a while, is this typical/happening to everyone? On the flip side, does Wealthfront typically adjust APYs back upward when fed rates improve?