First of we should stop the machine and search the main reason behind the not getting hardness of tablets.
Based on any freeze reason , we should work to correct i.e. Poor flow granule, Granule demixing process. within hopper, pre-compression parameter,main compression parameter, LOD/Water by Kkgf vakue if bledn, environmental manufacturing condition. If problem till a exist we raise the deviation to run the product with deviate hardness of tablets.
Based on deviation flow i.e. quarantine compressed tabs, remaining blend granules etc to be investigate and accordingly CAPA raise for further batch manufacturing process.