Hey, hope this is the right forum, not used this in quite a while ha ha. Just wanted to ask people on here what the right course of action is when a flatmate is isolating themselves and refusing to co-operate at all with the rest of the flat? It started with him not talking to any of us, which was fine in itself, but this quickly escalated to him running away from anyone in the flat the earliest opportunity he gets and waking up to stuff during the early hours of the morning when people on the corridor are trying to sleep! I've gently tried to get him to join the group chat we've got just so he can be informed of whats happening in the flat and maybe socialise but he seems to have just straight up ignored it and gone back to isolating himself in his room all day. The final straw came yesterday when he locked himself in the shower room and stayed there without the shower on for 10 minutes not doing anything while me and my friend were talking in the other room. Does anyone have any guidance on how to deal with this? I really don't want to call security but I'm beginning to get super uncomfortable with this guy's general behaviour.