This issue may cause by NIBP module pneumatic system leakage. Please exchange cuff and hose first to exclude that as a possible cause of the leakage. If the leak is not resolved then the leakage likely caused by the internal components of NIBP module.
The NIBP internal leaks maybe caused by dump valve, instruction will try to confirm if the dump valve has a defect.
Please enter service menu to confirm if the dump valve has some defect and cause NIBP leakage: