There are two bugs pertaining to the 60-second countdown timer shown in the V2 UI:
  1. Once the timer expires (reaches 0), it resets to 60 and no longer counts down until a browser page refresh. What's unsettling/misleading: it does keep refreshing network fee estimates etc. every 60 seconds in the background, just that the counter shown in the UI no longer updates.
  2. The counter actually counts 61 seconds; it starts at 60, sleeps 1 second, decrements to 59, rinse lather repeat, until it reaches 0, sleeps 1 second, then goes back to 60. It shouldn't reach 0; instead, it should reach 1, sleep 1 second, then reset to 60. Someone in the code needs to use <= 1 instead of <= 0 (or some such).