Does this issue persist all the time？
Do you have the same problem when using Teams web client?
If there is no issue in Teams web client, we recommend you try to clear your client cache file by following these steps:
- If Teams is still running, right-click the Teams icon in the taskbar, and then select Quit.
- Open the Run dialog box by pressing the Windows logo key +R.
- In the Run dialog box, enter %appdata%\Microsoft\Teams, and then select OK.
- Delete all files and folders in the %appdata%\Microsoft\Teams directory.
- Restart Teams.
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