The most frustrating part is that clients usually remember how well the campaign performed before the pause. After restarting, they expect those same results within a few days, which rarely happens.
 
I've had campaigns recover eventually, but I can't think of one that bounced back immediately after a long pause. There's almost always a rebuilding period.
 
One thing I've noticed is that campaigns with years of historical data seem to recover better than newer campaigns. The newer ones tend to struggle much longer after being restarted.
 
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