CPU Error after XPS13 upgrade to 1TB Samsung 970EVOPlus

Upgraded to Samsung 1TB 970EvoPlus SSD. Sometimes the system (9360) boots and runs just fine, but mostly I get a Amber/White blinking code (CPU Error) when I turn the laptop on. When I put the original SSD back in the unit, everything works perfectly. I used Macrium Reflect to mirror the original image onto the new SSD, so the contents of both SSDs are identical. When the laptop does manage to boot up with the new SSD (about 1 time in 10), it works fine.

Any thoughts or ideas? Thanks in advance.