kenwood ddx394

I have a Kenwood DDX394 installed in a 2005 impala itworks fine but I dont think it is getting enough power as cuts off depending on how long I've been driving or depending on how loud I have the volume I have the memory/ power wire going to the RAP relay fuse now I broke the fuse prong on the...

I have a kenwood DDX394 installed in a 2005 Chevy Impala the head unit works fine but it seems it isnt getting a steady power supply and cuts off the power and memory wire are connected to the RAP relay fuse I'm curious if that particular fuse isnt strong enough any help would be greatly...