Assume that your environment is Visual studio and TFS server.
At one day, when you make modifications in your solution, such as, create a new file, or update a file name. Then visual studio takes a long time to respond.
You may meet the TFS response problem.
In this case, you may try to restart visual studio or your system or make some other tries. But it won’t work.
You need to refresh your workspace to solve this problem, which means delete the entire workspace and re-make the mapping.
But you should backup your current modifications in the solution by shelve them.
Hope this can do help!