Yes, we have the exact same problem. There is another older post about this issues here:
From what I understand, there is a potential memory leak and also, something specifically with Intel Core i3/i5/i7 that they need to deal with. Perhaps there might be a fix in the near future.
As I mentioned, our Windows PC has even 16GB RAM, Intel core i5 9th-Gen and still have that problem. Xibo CS cannot do anything for this, unfortunately at the moment. We did pay for the support to troubleshoot however, we dropped it and move to Android box, as I mentioned earlier
We go with this hardware, and have not had any issues since (or yet!)