Clutch needs to be replaced for 3rd time@ 113000

Replaced: clutch pressure plate R&R included clutch disc and release bearing also outside labor to resurface flywheel, pressure plate, clutch disc, release bearing, pilot brushing @ 52,000 miles

Car was towed to same mechanic because clutched burnt out so replaced: clutch pressure plate R&R, resurface flywheel, clutch set @ 94,000

Yesterday the clutch burnt out & car had to be towed car it now has 113,000.

What could be wrong? We are not sure we want to replace clutch again without finding out source of problem?