FabFilter

Good morning,

I was already using Q3 for a while with great satisfaction. Recently I purchased L2 and since then Q3 is behaving strange. When I pauze working on my project for longer time, i.e. overnight, I leave my iMac and Ableton open to get going the next morning. Then I find several tracks being muted by Q3. Not graphically, that looks fine, but I don't hear anything until I move the frequency knob slightly. Then all the sound jumps back, like I hit the mute button.
Anyone familiar with this problem and know how to solve it?

Thanks,
Jeroen