Aksel is reporting this problem with the regen timer. He writes:
Easiest way to recreate it is like this: wait for timer to reach zero, when it does, don't do anything in md, no clicking no chatting, not even page refreshing just pretend you are away from keyboard for a minute or two. Then do something or just refresh MD few times, after 2-3 refreshes timer will be at it's own initial starting value, meaning those few minutes you weren't doing anything didn't got counted.