If something appears suddenly in alcatel equipment, and if there was no modification of frequencies (so it is not relate to interference), then it is linked to a little hardware bug.
Have you tried :
TRX RESTART
if still not okay then, RA LOCK/UNLOCK
if still not okay, then BTS LOCK/UNLOCK
But first of all, be sure nobody changed anything in the frequencies or some radio parameters.
Regards,
Pix