No I do take it apart to wash. But, once its clean and I put it back together I just leave it like that until its time to wash again.
I have this problem with my jacket. Not beekeeping jacket but my three year old worn daily work jacket. Basically the Fob (since that is what you called it I will get in line with that) has worn over the years and not pressing the teeth of the zipper together tight enough. IN the case of my jacket I can actually see where years of zipping and unzipping have worn the metal int eh fob away. I have twice repaired this jacket by taking a pair of needle nose pliers and squeezing the fob closed more. Eventually it will wear all the way through. My be your fob was not tight enough to begin with or has worn just enough to not get the teeth to latch. at any rate you might want to give you zipper a squeeze or to and see if it does not help.
I'm not sure about where to squeeze it tighter. If I squeeze it where I can I can't get it down the zipper.
Hmm, Not sure I can explain. but if you look at how the teeth pass through the fob to be pushed together. then imagine they are not being pushed together quite enough. It does not take a lot of pressing to fix it. not even enough to really tell you did anything. the sipper will just suddenly start staying closed. But in a nut shell close the space the teeth have to pass through just as they exit the fob when closing the zipper.
I hope that helps it is the best I can come up with without being there and showing you first hand. No insult if it does not help. sometimes words just don't get it done.
Had the exact same problem.
Metal Zipper FOB (slide) became worn out causing the metal zipper halves to not fasten properly tight enough.
Replaced it with a FOB (slide) from an old pair of Jeans.
Too replace it you:
Unzip the coat
remove the little brass stop at the top of the zipper on the side the FOB is attached too
slide the old FOB (slide) off
remove a FOB (slide) off an old pair of Jeans by just cutting through each side of the zipper with a pair of scissors
slide the replacement FOB (slide) on to the top of the zipper half where you removed the little brass stop
replace the brass stop
Takes less than 10 minutes
Too keep the problem from happening again lose a few pounds :D
"Slide", yeah, I like that better than fob.
I have lost some weight. My head didn't shrink though. lol