Sandboxed dashboard stops showing some widgets suddenly

We have observed that in the sandboxed dashboard versions, some of the widgets suddenly stop showing values.
What could be the possible reason and resolution ?

Hi @chetna
If you are an Enterprise customer, then please use the support email.
It's not possible to know what the problem is without seeing the full stacktrace from Admin > Troubleshooting > Logs. And also include "Diagnostic Info" from Admin > Troubleshooting.