Issue: Chat functionality gets restricted randomly as a result of Xbox Live services having issues, which prevents not only your own chat boxes from appearing (which inadvertently also restricts your ability to do any actions that require chat to do) but sometimes just outright refuses to send your chat messages. Strangely, while you cannot see your own messages, others can sometimes see your messages. Needless to say this creates a frustrating experience.

How to replicate: Unable to replicate it purposefully due to it being entirely dependent on Xbox Live services having issues for the issue to surface in the first place.