I am using Lightroom 5.6 CC. When I am editing a file, I frequently get "File cannot be found" , the photo freezes, then the photo is reset, so I have to start all over again.
At first, I thought it may be related to selecting the file from a key word selection, but I have found that the same thing happens when I go to the original folder.
I have never had this problem with V4.
Could this be related to my internet connection? I am using ADSL2
This is my system:
Lightroom version: 5.6 
License type: Creative Cloud
Operating system: Windows 8.1 Home Premium Edition
Version: 6.3 
Application architecture: x64
System architecture: x64
Logical processor count: 1
Processor speed: 3.0 GHz
Built-in memory: 15809.7 MB
Real memory available to Lightroom: 15809.7 MB
Real memory used by Lightroom: 1310.6 MB (8.2%)
Virtual memory used by Lightroom: 1277.9 MB
Memory cache size: 235.7 MB
Maximum thread count used by Camera Raw: 1
System DPI setting: 144 DPI (high DPI mode)
Desktop composition enabled: Yes
Displays: 1) 2560x1440
Retrieving data ...