Djay freezes sporadically on MB Air/ macOS High-Sierra

Using the latest Djay Pro 2.0.4 on a 4 years old Macbook with Core i5, 8 MB RAM.
Spotify and iTunes in parallel.
It seems that from time to time Djay loosing the connection to Spotify and than freezes. The Apple colorful wheel is replacing the mouse pointer for a while. During this time, the music plays but cannot do anything with the program. I always pray that the freeze will stop bevor the current title ends.
Is that a known problem, does anybody has the same issue?