Well, My experience with used products, in general, hasn't been going well at all... or with anything as a matter of fact... everything seems to have issues and I can't say for sure what it is causing these issues in each item. Could just be the cause of extensive wear and tear I guess.Now back to your keyboard... I'm assuming by saying "normal" you mean those standard membrane switches. Mechanical switches are designed to withstand a lot of wear and tear way more than any standard membrane switch. You could look up on google whether or not there may be an issue with the keyboard itself. Manufacturing issues of items do happen a lot... one batch of keyboards for e.g may have an issue that all the other batches don't... This just depends on how well each manufacturer handles quality control hence why sometimes two items may be just as good on paper (and somewhat in use) but one costs way more than the other. I would suggest trying to clean the keyboard If you can. Look up guides online... It's worth a shot before you sell it off and switch back to a membrane keyboard.- - - Updated - - -P.S What is wrong with the line spaces getting removed.PP.S I just saw the WTS tag... Didn't realize this was a WTS post... I just got to this ad by clicking on it from the main forums page on the right. (Sorry If my above "comment" isn't proper... I can remove it if you want.)