Same problem(s) here. It is really annoying currently to have to type in the master password that often. Out in the open I have to type a long nasty password on a smartphone display where everyone could watch .... that's exactly something I do NOT want and one of the reasons to use a password manager in the first place.
From the way it manifests I can only assume it is a bug (and not by design). Which gives me hope. Otherwise it might become a show stopper for me :-/