I have this problem and I don't have mobilelog installed : (. Its seems like a crap load of people have this problem but there isnt a full solution. Is there any other programs that may screw with facetime?
I hear you, same here.
I restored 3-4 times now because facetime keeps going down and I dont know what or why this is happening.
I gave up, Im stuck with no facetime and waiting for the 4.1 JB to update to and give it a shot.