The problem with switching champs and locking in first occured to me 2 maybe 3 months ago, never before. So I'm not sure if it is the same as the reddit post comment.
Not getting the correct rune page is very inconsistent for me, I know it happens sometimes to me for a long time, but I can not reproduce it when I try.
Hextech crafting is very slow/delayed for me, but Loot tab is a mess in general even on windows.