Sadly I had that experience, I was keeping the bank in my pocket and I thought I lost it, so I paid everyone out of my personal bankroll. Found the money was deep in a different pocket an hour after everyone left. I now have a locking cabinet with my cash and chips.
Similar thing happened to me. Now I use a locked cash box that's funded with like $300 in 1s and 5s. There's a special, blank spot just for that night's pool. Since I started doing that, have had ZERO issues. Also, I enjoy playing without a lump of cash on my thigh.