Somewhat Premature Ejaculation Problem

I slightly cut down on masturbation frequency from 3-5 times a day to 1-3 times a day (not necessarily by choice), I now find that a lot of the times I get off relatively quickly and the orgasms are of a low, barely noticeable quality. The initial “session” still last a pretty long time usually between 30 and 60 minutes but additional “sessions” have reduced in overall time from 10-15 plus minutes down to under five in most cases. Should I be concerned or could it still be a matter of me overdoing it?