Older players may have issues with the latest firmware versions and the latest channel updates. YouTube in particular is terrible on the older players. It's completely unusable on my old 2 XS, which is identical in power to the old 3500 Stick. It's more the fault of Google (they own YouTube), as they have updated their channel to work best on newer players, and have made the older ones impossible to use. And yes, YouTube recently changed the sound made while navigating the interface.
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Unfortunately, there's really nothing you can do to make it better. Right now a brand new Premiere is on sale on the Roku web site for $29.99. That is your best solution. Or switch to a Fire TV Stick, if you're tired of the Roku. However, the Fire TV is really Amazon-centric, and not as easy to use as the Roku interface in my opinion. And they start at $39.99.
Dan
Roku Stick (3600), Ultra (4640), 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.