connection between the 'freeze' function and automated muting?

I opened a project and was surprised at how wimpy the toms sounded. I had used Slate Trigger on them and I tend to freeze tracks when I put plugins on them to save CPU. 
 
I unfroze the toms tracks and I could then hear them properly in the mix. Then later in the track there was a guitar solo which was completely missing. I unfroze it and it "reappeared".
 
What these tracks seem to have in common is automated mutes. I refroze them and they were fine.
 
Is there an explanation for this?

Thanks for the clarification, Chuckebaby.