My Husband (78) Has The Following Symptoms. Falls Occasionally, Weakness

My husband (78) has the following symptoms. falls occasionally, weakness in the legs, gait - throws rt leg in front of the left leg when he walks, Has been to PT with no improvement. Once diagnosed with gluteal medius atrophy also has reasoning problems & problem solving. Unable to follow instruction during session with a exercise trainer. Memory is good. Started looking at soft porn on computer and TV even after addressed the issue and stating it would stop. Continues the practice. This is unlike him, a new issue. Has been to the following physicians. Family physician, neuro, ortho, sleep disorder, cardiologist. Has CHF