Screaming noise? Cuisinart ICE-100 new

We just got this Cuisinart ICE-100 and it's been very good. We have not used it every day – these small batches have been on different days.

The third time we used it, it started squeaking. At first it was just a small squeak – once every time the paddle went round, and it faded. By the sixth time, it was squeaking all the time. This is the seventh time we're using it and it's screaming.

If we run it without the bucket, it's fine – there's no rattle or gear slipping sounds. This is JUST from inside the bucket.

Does anyone have any idea what's going on? It happens even when it's just plain custard base.

Thanks!