Fumbles on punt returns are very common, but I think my release button because hot when that guy fumbles on a worse than 1 per 10 returns ratio.
For QBs it's the side effect of getting sacked, so it's more about sense rush and overall pass protection there to avoid them.
For RBs, I'm not quite sure where I stand. I think I'm fine with 1 fumble per 250 yd from scrimmage, or 1 fumble per 50-60 carries.
* 2005 Golden Scribe winner for best FOF Dynasty about IHOF's Maassluis Merchantmen
* Former GM of GEFL's Houston Oilers and WOOF's Curacao Cocktail