Additional features, settings, or issues not covered by specific Microsoft Teams categories
This started happening to me a lot more frequently after moving to Teams-only mode from Skype for Business for our phones last week.
This seemed to fix it for me (so far):
Uninstall Teams from the Control Panel.
Delete the C:\Users*username*\AppData\Roaming\Microsoft\Teams folder.
Download and install Teams from Microsoft (https://www.microsoft.com/en-us/microsoft-365/microsoft-teams/download-app).
Open Teams and click the profile picture and "Check for updates".
Click the "Refresh" prompt in the banner to relaunch Teams when the updates were finished.
my status mode was working great for about 5 days, then all my profile pictures disappeared yesterday, so I did what BatmanBob said and all my profile pictures came back - BUT now my status changes every five minutes to away just like before :( . . .