Same here on Xperia XZ1. First time it happens: hard reset, unlock sim ok, login with pin ok, “phone is starting...” and then black screen. I reinstalled the device completely, as soon as everything was up to date , black screen again. (I think it was around August 2018) Then I opened a ticket to ship it back to Sony for repair. While following the process - one day after - I double checked before the procedure to report it properly: no black screen. I did not ship the phone afraid I would have to pay for the shipping, while receiving a phone that is not fixed. Black screen did not happen for half a year or so but it started anew from time to time since May I think. Most of the time while it was exposed to the sun and hot. It has started to happen more and more. Sometime , just waiting is ok, the phone came back usable again. Can we have a have a logger of the proximity sensor ? Since the screen is going black, there is no possibility to check what’s the actual value live. At least if we can confirm this is the problem , it would help .
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