could you describe more precisely where is the repeater ?
is there a problem when MS is getting its coverage from the repeater ? or when the MS is getting coverage from the outdoor cell, in the vicinity of the repeater ?
I suspect the repeater is interfering the main outdoor cell, or perhaps there is a case of feedback leaking back into the repeater.
Where is your ‘donor’ antenna (the antenna of the repeater that is “catching” the signal from the main outdoor cell) ?
where is your repeater antenna ? (indoor ?)
what is the level from the outdoor cell in the room, when the repeater is “off” ?