^This. Obviously as you get progressively leaner, you may lose a bit of stability around wonky, or previously injured joints. When I started competing in bodybuilding, I noticed a lower back issue that I had suffered years before in a strongman contest would resurface when I got close to show date levels of leanness. My brother (Dpt) and myself reasoned that as I lost the extra 'meat' around the area, I became more succeptable to losing some of the stability I usually had when doing Stiff Leg Deads or other more stressful movements.
So while your strength shouldn't plummet if you're doing everything intelligently, you also have to constantly look at the big picture. If you do something stupid at the end, you can ruin what would have otherwise been a great prep.