15 beta5 crashing frequently in multicam

2 camera multicam 1080/30 timeline using 4K footage from Sony FS7 and FS5. Taking selects from edited multicam sequence and pasting them into a new timeline.

I've been working on this sequence since DR 17 was first released and have had no issues plus in Beta 4 no crashes. Upgraded to Beta 5 and crashing frequently, like 6-10 times per hr. I'm using ProRes Proxy set at !/4 and the proxy files are on my SSD drive.

Live save is on so nothing lost just wanted to put the issue out there.

Thanks






IMac (Retina 5K, 27-inch, Late 2014)
OS 10.14.6
Davinci Resolve Studio 17.0B build 15 (Beta5)
Processor: 4 GHz Intel Core i7
Graphics Card: AMD Radeon R9 M295X 4096 MB
Memory: 32 GB 1600 MHz DDR3
Startup Disk: Mac HD/3 TB Fusion
Graphics: AMD Radeon R9 M295X 4096 MB
Video Drive-1 G-Raid Studio, 6TB, Raid 0, W306.8, R305.1
Video Drives-2 6TB Raid “0” in OWC Raid Housing, W 328 MB/ R333.7 MB/s
Video Drive-3 4TB G-Raid "0", W245.9....R258.0
G-Raid 6TB Ultra Studio thunderbolt raid "0", W229, R 232
G-Raid 8TB Thunderbolt Raid 0, W 225 R 358
Sandisk rugged 2TB SSD

1 additional HDMI system Monitor
1 4K monitor thru the Ultrastudio Minimonitor

As the day progressed, crashes became less frequent until pretty much not happening in hour 8 or 9 of edit. No idea why?