Not going to say this will solve anything but many (myself included)have found that connecting their PC directly to their cable modem/dsl (no router in between) has solved their crash / black screen issues.
For reference:
https://forum-en.gw2archive.eu/forum/support/tech/GW2-doesn-t-like-Routers/first#post48362
Same here after reading these posts I removed my router (Linksys WRT54G) and played all weekend with only 1 DC at peak playing times. As a futher check on Sunday I hooked the router back up and sure enough with in about 10mins of play I was DC’d, took it back out of the loop and played the rest of the day with no problems. I tried setting my PC up in the DMZ of the router but that had no effect for me.
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