Well, it's more than a couple of years old. The purple Stick (model 3500) was released in March of 2014. There's nothing to do in your account. What you can try is doing a network reset, and see if it clears up your network issue. Since the Stick+ is on sale for $30, it might just be worthwhile to replace yours. Besides improved WiFi, the new stick is far more powerful than your old one.
Dan Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.