This is a PC based control and can exhibit ALL the problems of any other PC.
You need to do a SCANDISK and DEFRAG and check your CMOS settings to see if they are correct for the hard drive you have.
It is common for the CFGPRMS file to get scrambled. This has the TLOs in it.
It can be deleted and the software SHOULD make a new one.
It is also possible that the software may be corrupted.
George
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)