How to avoid Adobe Pr allocating but never releasing GPU memory?

I purchased an iMac two months ago for video editing purpose. I use Adobe Pr. Here is my iMac:

• 4.2 GHz Intel Core i7 Quad-Core
• 32GB of DDR4 RAM | 1TB SSD
• 27" 5120 x 2880 IPS Retina 5K Display
• AMD Radeon Pro 580 Graphics Card (8GB)

But one month ago, the system started to show "Force Quit Applications: You system has run out of application memory. To avoid problems with your computer, quit any applications you are not using". Even though I only used Adobe Pr, it constantly showed up and I had to restart Adobe or the iMac. I contacted Apple, reorganized all of the footage, and reinstalled the Adobe, but the same problem is still there and comes more often.

I searched online for solutions. I found one answer: " I recently saw this issue with almost all of the system memory free. The problem was a faulty program that was allocating but never releasing GPU memory. Since all screen display happens through the GPU, using up all its memory is enough to cause a legitimate out-of-memory error, even when plenty of system memory is available." I think this is the correct answer for my problem. How to avoid such problem to release my GPU memory? The Adobe Pr doesn't work smoothly on my system now, constantly"force to quit".

Really appreciate your solutions!