Maybe it's not the ideal solution, but the crackling noises in Solina can be silenced by turning down the reverb, provided you own the stand alone plug-in. You can add reverb later in your DAW. I can't say if this also counts for Matrix, but I expect the same applies.
Some say that increasing the buffer limit may improve general performance, but it will also increase latency. As for the crashing problem: Save your project regulary. No idea if there will be another bug fix that will make Lab more stable. But maybe the problem may also relate to the workings of Ableton or the capacity of your device's working memory.