GW2 - Cold Resistance buff

In Guild Wars 2's new Living World Season 3 episode, there is a new zone called Bitterfrost Frontier. The northeast area of this zone is called The Bitter Cold. To survive in this area, players need the Cold Resistance buff. Players have been complaining that once the buff wears off after 14 hours, they are not able to get the buff back again. Even after finishing the grawl Renown Heart quest, players cannot buy the Grawl Firestone from the kodan, Sun Warming. This was what I did to get the buff again:

• Replay the episode. So I had to redo Precocious Aurene up till the story quests Elixir Recipe & Elixir Cookin'. I couldn't just start from Elixir Recipe because it is out in the open world and not instanced.
• Collect the ingredients to make the Thaw Elixir: Clump of Frostbitten Suet, Fresh Winterberries, Cold-Resistant Eggshells & Grawl Firestone.
• For Cold-Resistant Eggshells, you have to do the Renown Heart by a quaggan, Woomulla in Griffon Old Growth.
• For the Grawl Firestone, you have to do the Renown Heart by the kodan, Sun Warming in Brakbrak Ice Snarl (grawl cave).
• You MUST complete the story, Elixir Recipe! This will allow you to buy the Grawl Firestone from Sun Warming. BUY MORE THAN 1 so you can keep making the Thaw Elixir while waiting for Anet to fix this bug!
• You can continue to Elixir Cookin' to get the Cold Resistance buff but just stop at that point. For some reason, players who complete the storyline cannot access the Grawl Firestone vendor after that.

Hope this helps! :D