Distorted and chopped sound in loop mode

Hi, when I play a project in loop mode, when I do the first repetition and afterwards the sound is stung and slowed down. The performance meter in the Real-time Peak section remains at 100%. If I only play a few bars, it does not happen. After moving the locators to occupy the entire project it does not do it until I reopen the project again.

Mac Pro 2012, 2x6@3,33, 64 GB RAM
High Sierra OS
Cubase 9.5.1