My Vice 2 experience

I bought Vice 2 after watching videos about men having prostate orgasms 😀. I was intrigued and I thought why not give it a try. So I went about impulsively buying an Eros Vice 2, without having any expectations of incredible pleasure and success. As of now, I have been using it for past 5 months. Vice 2 was my first time playing with my butt and I am pretty pleased with how it turned out. I was pleasantly surprised to have my first super-o within a month. For first couple of months, I used to have my first super-o after about 75 mins into the session, this decreased to 60 minutes in another month and then down to 45 minutes. I used to begin with 10 mins of relaxation, followed by another 10 minutes of muscle contractions, then the involuntaries would begin. In short, I used have series of mini-o’s culminating in one or two super-o’s with sessions lasting about 90 minutes. However, past couple of weeks have been very strange. Now my involuntaries begin as soon as I insert the massager, then within 10 minutes I have explosive super-o followed by one or two more. Then I have noticed that I am spent, I do not want to continue neither does my prostate. I liked my earlier sessions containing series of many mini-o’s followed by 2-3 super-o’s with the entire pleasurable session lasting 1 to 2 hours. Now it is down to 20 to 30 minutes. As soon as I insert the massager, there seems to be no way to delay, looks like my body simply does not want to wait anymore. Not sure what to make of this. Any one has such experience? Any thoughts?