Hi, I've been using the same soldering iron for many years, make/model no marking long ago worn off, with a supply of tips that until recently I thought would serve for the term of my natural life. However, over the last few months I've found that tips stop working well a lot more rapidly, they look nice and shiny but have weak heat transfer and won't tin. The most recent instance came up with problems after less than a weeks service, in time gone by a tip would last for a year or more.
I wondered whether my resin cored solder might be the cause of the problem, the roll I have is also years old.Can't see anything else that would cause a problem. Any thoughts?