I'm beginning to regret buying the Bose QC twos

They just don't sound good anymore, I've had them for 5 months now they sounded incredible at first and now they don't, I know it's probably cleaning that's the issue but I've cleaned them and they still don't sound good. Not only that I've had connection issues since I've had them, sometimes they'll just like randomly disconnect for no reason, or they won't connect at all. I really wish I hadn't spent the $300 on these earbuds, it's not worth it, my old JBL earbuds sound better in their current state, they were only $50 too. It's to the point where I might literally just go back to using my old, cheap JBLS as dumb as that sounds.