If you try to open the lock with the PIN and a high pitch alarm sound occurs after entering it, this means
You entered the wrong PIN more than 4 times in a row.
The time is not adjusted
The wrong PIN
If you type to try the wrong PIN more than 4 times, for the lock it is like warning that someone, who does not know the PIN, is trying to enter, so a warning alarm sound will be on and the lock screen will freeze about 4 minutes - after you will be able to insert the PIN again.
The time is not adjusted
Open the lock with spaces or Goki will update the lock battery status. ( The apps may ignore sending battery status if there is no Internet connection, or another error happens while reading the battery … )