I got a call that a client was having problems with their patient (customer) queue and keeping people in the queue. Apparently, when the queue was refreshing, it was appearing that all persons had been flushed and it wasn't able to hold them (their order in the queue and who was in the queue). We looked at servers, code, and finally they confirmed that all was well. No physical changes happened, it just seemed to start working again. Kinda random.