I am getting this same glitch! it started a few weeks back, only on an external output. the preview has always been smooth for me. Now a few days ago, with resolume open I selected a clip, it started outputting for a min, then the MSI laptop shut down. I started back up and opened resolume and selected a clip again and it started playing but was glitchy again. This happened a few more times that evening. Then last night (after updating resolume) it was running fine for an hour and then randomly my laptop screen and the output screen started flashing black for a second then would come back on. This happened many times and started happening more frequently. I restarted the laptop and disconnected the output and it has continued flashing black on me with nothing but the desktop up. Any help would be greatly appreciated!
I am running a 1 month old MSI GE75 Raider 9SF:
2.6 GHz Intel Core i7-9750H Six Core
16GB DDR4 | 512GB NVMe PCIe M.2 SSD
17.3" 1920 x 1080 144 Hz IPS Display
NVIDIA GeForce RTX 2070 (8GB GDDR6)