Thought I would post this for anyone else having this problem. In almost every shop having "file locked" and/or "cursor is read only" the problem was caused by a bad ethernet cable end. Most of my customers are small shops and many have done the cabling themselves. After, at my suggestion, they have a pro come in and check the ethernet switch and cables or they just replace them with pre-made cables the problem is fixed. Error logs go from several a day to nothing.