On the crafting button flicker and missed clicks — the x1/x5/x10 buttons are a known issue. A fix was just shipped for the action buttons (same root cause: UI rebuilding while you're mid-click), but the crafting buttons weren't covered by that fix yet. It's next in line. The intercept button is likely the same problem.
Tech tier unlock sound — noted, will replace it.
"Insert Circuit Board" — Could you say which tier you're on and what building or tab you saw it mentioned in? Circuits are crafted items (Assembler or manual crafting queue) rather than a manual action — it's possible something is referencing it in a tooltip or goal text that isn't matching the actual recipe name, which would be a bug worth tracking down.
Working on a fix will be available soon.