If the 1.45 volts is CPU voltage and the computer shuts down then you either have a defective PSU or Processor.
CPU voltages can easily fluctuate or spike between 1.0 and 1.50 or higher constantly. It will never go beyond a voltage where it will damage itself.
Possibly your CPU is overheating and shutting down when it fluctuates or spikes above 1.45 volts.
Download OCCT and run the PSU Test and see if it shutdowns or crashes during the test.
First check your PSU Outputs on OCCT and make sure the 12 and 3.3 and 5 vdc are within 5% tolerances.
Also keep a close eye on Temperatures and fan speeds to make sure all fans are working normally and nothing is overheating.
EDIT: Forgot to mention and put everything back to default in BIOS and in Ryzen Master to get a good test results from OCCT.