STEMS audio crackling when isolating parts after ~10 minutes of mixing (DDJ-1000 / MacBook Air M4)

I'm experiencing an issue with STEMS in rekordbox. After approximately 10 minutes of mixing, audio crackling occurs when I try to isolate or remove a STEMS part (for example, removing the instrumental to isolate vocals). The crackling happens on either deck 1 or deck 2—not both simultaneously—and persists on that deck until I restart rekordbox.

Setup:

• rekordbox version: 7.2.11
• macOS: Sequoia
• Hardware: MacBook Air M4, 16GB RAM
• Controller: DDJ-1000

STEMS and audio settings:

• Buffer size: 512 samples
• STEMS mode: 3 Stems
• Prioritized sound quality: Enabled
• STEM waveform: Enabled
• STEM instant doubles: Left/Right
• Increased memory size for analysis: Enabled
• Multithread: Disabled
• Groove circuit: Disabled
• Video: Disabled
• Lighting: Disabled

Symptoms:

• Mixing works fine for the first ~10 minutes
• Crackling starts when I activate STEMS separation (e.g., removing instrumental or isolating vocals)
• Affects one deck at a time, either deck 1 or deck 2
• The blue STEMS analysis progress bar is still visible/moving on the affected deck
• Issue occurs on both battery and AC power
• Disabling STEMS entirely eliminates the issue

Is this a known issue, and are there any recommended fixes?

Thank you.