My G6 has lately been getting extremely laggy. 8 seconds to launch Firefox + uBlock, 4 seconds to get a keyboard after tapping the address bar; I don't use it much for more than texting or calling people, but it's a bit ridiculous. And there used to be plenty of space on the 32 GB built-in storage (and there's always abundant space on my 256 GB uSD for photos and media) but even with fewer apps installed now there's less space available.

Have you ever had to reflash yours or anything like that?