Well my system has gone 7 days now without a fault on the CPU hitting 100%.
Im running 5.3.0.3 (07/13/2020)
When I rolled back from 5.3.7.x this version auto-offed HA in all the Cams. Fixed that. Then lowered fps on live view to 10fps. The 4 Fisheye’s were flaking out on h.265. I clicked on page defaults for those and they chose H264H. Flakiness fixed. Stable today . 10-13% cpu @ 2.6 GB Memory usage.