UiPath.Core.Activities not load correctly

Hi, all.

In UiPath Studio, UiPath.Core.Activities may not load correctly.
As a symptom, Message box is no longer displayed in the Activity list, and icons of Click activity all change to Sequence.
Once uninstalled from the Manage Packages, reinstall it and restart Studio, it will be fixed temporarily.
However, the same phenomenon will occur again after a while.

I’m in trouble because the same symptoms are occurring on multiple machines, so plz tell me the fundamental solution.

Thanks in advance.