Call came back from the dead

### Steps to reproduce

After the call (in app), the call seemed to start again a few times, triggering the toast notif. Some people accepted, and the call began again.

### Outcome

#### What did you expect?
Call to end after we left and not to start again.

#### What happened instead?
Call started again several times.

### Operating system

Various

### Browser information

Various

### URL for webapp

call.element.io I think - whatever powers the in app calling when launched from an element.io account

### Will you send logs?

Yes