Chat
If a reply hangs, you'll see an error message within a few seconds, and you can send your message again.
The buttons in chat for check-ins, the diary card, reminders and goals stay in your chat history when you come back, and older conversations have them again too.
Camera on a work device
If your organization's device policy blocks the camera, you'll see a message about it. Ask your IT team, then try again from that screen.