I can suggest a fix made for OBS it might work, you can revert the changes if anything goes wrong or if you just want to.
Assuming you're on windows 10.
1. Open Settings > System > Display > (Scroll Down) Graphics Settings > Classic App then add streamlabs OBS > Options > Power saving
2. If you use nvidia graphics card, open nvidia control panel > Manage 3D settings > Program Settings > add streamlabs OBS > Integrated Graphics