i was about to made my pick at a ranked game, as the fourth player in my team, when suddenly the time ran out a few seconds before the timer reached 0. After i was put in the lobby, i heard the ticking of the last seconds of the clock. I'd be glad if someone looked into it. Information that may be of use: i tend to have short disconnections about twice an hour.
Ya that disconnection or packet loss can cause this. If your client misses the data from the server that says a player locked in, your client's timer will keep ticking down to zero before moving on while the real one (on the server and their clients) had already moved on. This will cause the next pick to have less time than displayed.
If you have packet loss or lag spikes often, you probably want to contact your ISP and get that sorted out. In the meantime (if you continue to play), hover something so that if it happens you at least lock something in instead of accidentally dodging.
