I think he's struggling with the pressure, which is understandable, but I don't see signs that he's lost the players.
The Cantwell situation concerns me a little, but it's no good speculating and building up possible scenarios based on a total lack of information.
EDIT: The key question is why are we making all these individual mistakes? Lack of confidence, of course, which gets worse with each loss. Lack of communication, probably. I think we underestimate the sheer togetherness of the squad over the last couple of years, with even 'fringe' players like Hugill and Hernandez playing a great part in squad unity, and people who played sporadically, like Vrançic, not rocking the boat. Lack of leadership on the pitch, probably. At some point in the future Gilmour will be that kind of leader, I think, but he seems too young now and he's also a loan player, and it's much better if the leader were a permanent member of the squad. (Cantwell may not be a helpful influence on this level, but that is unfounded speculation on my part.)