As EDIUS SW default, the render service stops queued job as soon as you start playback. Because playback runs prior to other job to have better playback performance.
If you prefer running the background service simultaneously, deactivate the option:

1. Select Settings > User Settings > Application > Background Job

2. Untick Pause Background Jobs During Playback

3. Click [Apply] > [OK]

IMPORTANT NOTE:
Simultaneously running of the render service may affect to playback performance. You may be required using Render menu or draft preview if playback stutters.