>>87476932sounds like what happened is you met your threshold for systemic fatigue and your body demanded you stop
if you work out consistently at max effort this will happen, and it will happen more frequently as you get more experienced (bigger muscles require more recovery,) usually settling in the 4-8 week range depending just how hard you train (training with reps in reserve is less fatiguing, on the other end of the spectrum post-failure training such as myoreps are immensely fatiguing)
this is called a "deload" and people training seriously do it intentionally, each cycle of pushing their body to the limit and then taking a deload is called a "mesocycle." you don't HAVE to do that but keep in mind at some point fatigue will accumulate and you will "fall off the wagon" as you call it.
