I'm still running my 5700 XT and I'm still experiencing intermittent crashes. It's great to see the card is still a strong performer, but it's not worth it when the card randomly dies for no reason.
Without getting into too much detail, I've tried a lot of things to make it stop. I'll have to give Steve's suggestion of a new DP cable a try. In all my troubleshooting I've never seen that suggestion and it would be weird if it helped... but still cheaper than a new GPU.
Which model do you have? Some of the lower-end models have an electrical connector that is insufficient for the power needs of the RX 5700 XT. My XFX RX 5700 XT Triple Dissipation crashed the entire system quite often. I sent it to XFX for RMA and they sent me back a THICC-III. The THICC-III
never had that problem but I noticed an interesting difference between them. I believe that this is the difference that caused the system crashes because a driver crash can't cause a system reboot, only a hardware issue can do that, usually something to do with power distribution.
I'll illustrate:
Here's the XFX RX 5700 XT Triple Dissipation:
And here's the XFX RX 5700 XT THICC-III:
Now, if you look at the power connectors, you'll see that the Triple Dissipation uses an 8+6 plug configuration while the THICC-III uses an 8+8 plug configuration. I believe that the 8+6 is insufficient for the power needs of the Navi 10 GPU and causes the system to crash when the card tries to draw more power than the 8+6 can deliver. This causes the card to stop functioning and so the whole system crashes violently. OTOH, the THICC-III with its full 8+8 power connectors never had a problem. This is exactly how cards would react to a lack of needed power.
Another aspect of this situation that makes me think this is likely is the fact that reviewers NEVER experienced this problem. When an AIB sends a card to a reviewer, they ALWAYS send their top-line model. Steve's Powercolor Red Devil is a good example of this. The top-line models would ALL have the same 8+8 connector like the THICC-III, one of XFX's upper-tier models. As a result, those cards would never experience that same inability to deliver enough electricity to the GPU and so the reviewers would never experience those violent crashes. At the same time however, the general public tends to buy the lower-tier models because they're less expensive and deliver almost the same performance (like maybe 1-2% slower). Therefore, the general public would be experiencing these crashes all the time with reviewers having no idea why.
I think that Steve Walton himself would call my theory sound.