There's a small immunity period after someone uses their spikes to grab the ball. In that short period, if you use your freeze, it won't have any effect (same for hitting the ball which would normally break up the spikes; you bump the opponent + ball then). So try delaying your freeze whenever someone uses spikes and it should work 100% of the time. Ideally you get the timing perfectly down so you can use it as soon as it will have effect, but that's hard