Grip studs and washers

[DZ]

So I had a problem last year with grip studs leaning and pushing through the sole of my wading boots. So this season I added stainless washers based on advice from others. Everything worked fine until this week then I had the telltale feel that another one was coming through the sole. The augers on the studs are very sharp and when they come through your boot you know it quick! It seems some of the washers fell off when the body of the grip stud started to deteriorate/rust and can no longer hold the washer. Has this happened to anyone else?