But naturally by virtue of not increasing the weight on the bar one will reach a point where one ceases to get stronger (measured by the amount of force you can produce). There are limits to what more reps will do for you.
So don't deadlift your 1RM every time you go to the gym, just slowly increase how much you lift in a safe and structured manner.
So unless you are a professional (then you already know about this more than I do), lower the weight and stick rather with 15-20 reps. If you feel that given excercise is too easy during set, just another 5 reps and try to do perfect movements. YOu can get the same famous 'burn' in the muscles. This also builds stamina, which is much more beneficial in real life compared to pure power for few seconds.
Needless to say, since I switched, i didn't have a single injury, not even minor stretches. Even if I am totally exhausted, I can handle the loads I use to put them down/to the rack safely.