Sample rates problem on VST32

[SpotlightKid83]

I'm using Cubase VST32, I record at 48.800 but everytime I minimize Cubase to go to another program for a sec, I go back to cubase and the sample rate has changed to 41.100, sometimes not even using another program. During playback everything kind of freezes and when it gets back the sample rate has changed to 41.100.
I tried locking the sample rate at 48.800 on the soundcard control panel but it keeps happening.

Any idea of how to solve this??