i have the same problem with my 9month old,
she is in the house all day with my parents she will play eat etc,
but when i come home in the evening and leave the room to have a shower or anything she will cry at the kitchen door til i come back
so i find myself having to sit with her every second of every night,
is this just a phase?she has free run of the kitchen with her toys bed and food and water,i dont mind sitting with her but this is not alway possible