I've heard of this happening on other forums with people running big tires and really abusing their Jeeps but it doesn't sound like you were abusing yours. What size tire you running? A Dynatrac ProRock 44 would fix your problem, stronger than a factory 44 or 30 housing. There are a couple companies that have sleeve and gusset kits out for a factory 30 also.
2008 Wrangler Unlimited ARB bumpers and bottle opener, Warn winch, Lightforce 170's, OME shocks with 618 and 619 springs, JKS trackbars, AEV Bridger wheels, 305/70R16 Cooper Discoverer STT's
1994 Mercedes Benz S600 Coupe 18 inch staggered AMG Monoblock II's
2007 Wrangler Unlimited Sahara stock (sold)
1998 Wrangler Sahara ARB, Warn, AEV, OME shocks, Trailmaster springs, Airlift, Rubicon Express, 5 spoke Ultra wheels, 33/12.50R15's Goodyear MTR's sipped (sold)