Normally I walk the beach early in the morning and find most of the stuff the tourists loose.
Also If I am desperate I will put my lobster pots within casting range of known hot-spots...this usually yields a bi-weekly bounty.
(just kidding )
One time I had a line problem and I snapped off 3 tins in a row. That was the worst. When the last one flew into outter space you might have heard me scream WTF!! I took off the reel and threw it into the back of the truck while murming 40 years experience all for naught!
(It happens to everyone now and again)
Last year I think I lost two or three plugs total.