Our expert says:
This could be either penis fatigue or Erectile Dysfunction (depending on your age and health). Additionally, this could also be something non-medical: just like you can have a headache for no apparent reason.
My advice: you are still able to maintain an erection on a regular (even above average) basis. Thus, no pathology is apparent. In this line, it is nothing irregular. However, if it persists on a daily and continuous basis, you will need to seek help.
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