There are some real cool apps that will help you learn what's going on with your music.
Try this one when you are trying to understand a new chord.
https://play.google.com/store/apps/details?id=com.rabugentom.chordfree
Probably the best move is to swap it if it has ageing and rust but if your don’t use the tremolo at all then blocking the trem would your best and cheapest option there’s a system called a tremNO that you hook up to the Floyd as one of your springs here’s a link: Allparts Tremol-No Tremolo Locking Device - Large Clamp https://www.amazon.com/dp/B004MNCU1I/ref=cm_sw_r_sms_api_i_C.XpFb7KJWPNA