A set of improvements are available in today’s 8.4.7 update.
We are still investigating one other potential cause, so if you are still seeing issues in 8.4.7 please send in a diagnostic report from your device and post the code here. Thanks! 
A set of improvements are available in today’s 8.4.7 update.
We are still investigating one other potential cause, so if you are still seeing issues in 8.4.7 please send in a diagnostic report from your device and post the code here. Thanks!