It could depend on many things but I would first look into:
1) Nutrition
2) Sleep Patterns
3) Amount you are training (Over training?)
4) Method of progression
Are these things consistent, day in and day out? Are you listening to your body? Are you fatigued and sore? Are you trying to increase too fast?
In order to get consistent results (output) from your body you need consistent input and slow/steady methods for progression (wether it's for weights, endurance, or anything in between).
IW
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