Is there any instability after the patent right is granted?

In general, there will be no unclear problems described in your patent application documents, because:

The application document for a patent for invention can only be granted a patent right after substantive examination, and in the process of substantive examination, the examiner will point out all the problems that are not clearly described in the application document for the applicant to modify, and only after the application document is clearly modified in accordance with the provisions of the Patent Law can the patent right be granted.

In the preliminary examination of the application documents for a patent for utility model before authorization, the general examiner may also point out and ask the applicant to modify the similar obvious expression of "etc." In the claim.

Suppose what you said happens, it will definitely affect the stability of the patent right, because unclear expression is one of the reasons why the patent right is invalid. Because in the process of invalidation, only the patent right can be modified, so this situation is more dangerous, but the specific situation will be determined according to the specific content of the authorization application documents.