A freezing/crashing issue with a CPU is an anomaly, not normal behavior for that line of CPU. Don't decide against Threadripper because some can be unstable Bobby, just as your Dell might crash sometimes, but that doesn't mean not to buy a Dell.
And Dan, definitely get it looked at by someone with knowledge about *workstation level* systems, CPUs, cooling, and power. I guess perhaps the shop you bought it at, which it sounds like what you're doing, but honestly if they do not specialize in high-end machines you might consider somewhere else. Those CPUs are available for anyone to purchase and build a system with, but that doesn't mean that any random PC building shop will know how to best configure, power, and cool it.
- Oshyan