So, I lift in a fairly dedicated cycle, 3x/week. Been getting steadily stronger for a long time but lately I have not merely plateaued, but started to lose ground. E.g, two weeks ago I deadlifted 280x5. Last week, 280x4. Tonight, I could not do 3 reps! Also losing on bench and shoulder press. (Squat holding firm so far, but at the fairly girly level of 155). All this happened within the last month or less. Before that, I was at my personal best on every lift except the squat. Am I dying, or is this typical, and if the latter, what should I do?