i have an iphone app that subscribes the client to 3 streams
all are of type COMMAND

in the app they are subscribed one after the other
most of the time all works well
but since yesterday i keep getting this error when i subscribe the 3rd stream (while the first two keep being subscribe succesfully)

i cant find the reason for this error:
Failure connecting to lightstreamer: Lightstreamer connection exception (reason: 'Connection stalled for too long')