Its the god damn automation on tracks that causes all these spikes and drop outs and this and that. Even happens with Ableton effects only.. But i think it really has something to do with with sub groups.
Large track count songs (20+) with automation on one channel thats sub grouped into one channel with 2 other track (so a total of 3 tracks sub grouped to one track) will cause heavy glitches and spikes. I noticed it started happening when i would add some delay on the end of a track right before it was punched out. And that track was automated and in a group. Took the automation out. Stopped happening..
No fuckin wonder this shits been happening to me ON EVERY fucking song i create on Ableton. Fuckin sub groups and automation are buggy! Of course!