Yup. Worse bit, I got it working, showed my co-worker that it was working, but I wasn't feeling great so I took off early. An hour after I leave the bug shows up and starts making havoc so my coworker has to shut it down completely.
Fine, get in early the next day, test it out on the dev computer, no problem, test it out on the production computer, no problem, throw in a few extra debugging steps and stuff to try to figure out where it is going wrong, then leave to get out of town for the weekend. About an hour after I leave it starts acting up again.