We have one department (Surgery) in our hospital that will go through a period where most of the 7950 they get busy signals. While the rest of the hospital is fine. We have a WISM blade running 188.8.131.52 in a 6500 the controller used for the Surgery department is also used in other dept's which have no problems. We have had a site survey done and rechecked several times. We don't use Auto RF. We do haowever get Coverage holes most of which are int the Surgery dept.