MS Access shuts down

Access can shut down for a variety of reasons. The largest single reason in a multi-user environment is because Access is meant to be a desktop database not a network DB. Due to how Access handles data requests and performs locking within the mdb file it may be a contention (hence the random nature) or a curruption problem with the DB. Try rebuilding the Access DB when this happens again if you can, it might relieve the problem. Are other users using the same configuration as this user? Are they performing the same tasks accessing the same tables? Blue screens of death are typically memory issues, is this a homegrown application or third party? You could be dealing with a memory leak in the software or the softwqare is trying to write to protected memory? Hope this helps as you can see it could be many things, the least of which I believe is your office load.