Chat system erroring increasingly common

Describe the bug. Describe what is happening when the bug occurs. Describe what you would normally expect to occur.
Chat system has been causing many server side errors over the past 48 hours. In the past 24 hours these 4 errors have appeared in my error logs over 700 times. All errors are recorded through GameAnalytics

HTTP 0 (HTTP 500 (HTTP 500 (Internal Server Error)))
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Script ‘Chat.ChatModules.FriendJoinNotifier’, Line 46
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Chat.ChatModules.FriendJoinNotifier:45: HTTP 0 (HTTP 500 (HTTP 500 (Internal Server Error)))
Stack Begin
Script ‘Chat.ChatModules.FriendJoinNotifier’, Line 45 - function TrySendFriendNotification
Script ‘Chat.ChatModules.FriendJoinNotifier’, Line 57
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loadChatInfoInternal had an error: HTTP 503 (HTTP 503 (Service Unavailable))

loadChatInfoInternal had an error: HttpError: NetFail

How often does the bug happen (Everytime/sometimes/rarely)? What are the steps that reproduce the bug? Please list them in very high detail. Provide simple example places that exhibit the bug and provide description of what you believe should be the behavior.
Over the past few weeks it has been occuring more and more frequently, starting at a handful of times a day 3 weeks ago to over 700 in the past 24 hours.

Where does the bug happen (www, gametest, etc) Is it level-specific? Is it game specific? Please post a link to the place that exhibits the issue.

When did the bug start happening? If we can tie it to a specific release that helps us figure out what we broke.
Over the past 48 hours the occurance of it has shot up dramatically with 700 instances in the past 24, and roughly 600 in the 24 hours previously over roughly equal visits.

Anything else that you would want to know about the bug if it were your job to find and fix it.
Instances seem to be steady over the course of the day rather than occuring in small windows. No modification to the chat system have been implemented in this game.