My KAC-7205 goes immediately into protect. how do i fix it?

i own a KAC-7205 amp connected to two 12 hifonix HiFi12D4 subwoofers. they used to only cut out when i would go uphills. but now they have cut out completly, cause my amp immidiatly goes into protection mode when i turn my car on. what do i have to do to fix this? my ground wire is secure ive checked it, my power wire is good. no fuses blown and it is wired to the subs correctly. any suggestions would be greatly appreciated.