Same issue here. I had songs up and running working fine with low track counts and low "disc" numbers. And then on many different tracks in multiple songs, audio tracks drop out. I can see the waveform, but the red warning light toggles on (with not even a slight meter move or other layers or FX coming in) and the audio no longer plays from that point. It will play prior to that point but not after.
I have tried running it off the internal SSD, and external SSD, changing block sizes and dropout protections. No change.
It is very annoying as it has destroyed several works in progress.
When you have a paying customer in the studio with you and this happens, it's embarrassing and non-billable.