modern FF is like russion roullete, can be changes that create havoc and have to hope for the best.
one such change is the removal of the ability to disable keepalive which can have some bad negative effects. Wasnt impressed how the decision was made to remove it, basically a dev on a whim who wanted the option removed made a patch, and it quickly got integrated into the app, there was little public discussion on that change, it just happened.
the typical fix they love to dish out is reset your profile (in other words making you configure it all again), when that doesnt work they either give up or start blaming the end user or the end user's pc.
BT Infinity 2 Since Dec 2012 - Estimate 65.9/20 - Attainable peak 110/36 - Current Sync 71/20