I dunno what needs to be done, but something has got to be done on bungie's end for this. I've been getting this weasel error code like every 30mins-1hr I try to play destiny on my PS4 for the last few weeks. I've done everything from clearing the cache of my system, changing my router from my internet provider, resetting my router, to checking and opening the ports of my router, to putting my ip for my ps4 into a DMZ zone so that all the ports are open and this STILL KEEPS HAPPENING! It really makes this game practically unplayable. I like the game I really do but if this continues I can't no longer play or endorse this game at all.

As a good starting point, try clearing your console's cache: https://www.bungie.net/7_How-do-I-clear-the-cache-on-my-console/en/Help/Article/12539 If it still doesn't help you, check your detailed network statistics on your console to see if you have any irregularities (packet loss/high latency)