good luck with making a claim off them dont think i have ever heard of anyone do it successively..
as for has anyone heard of this problem before search this BMW N47 TIMING CHAIN PROBLEMS internet is riddled with stuff about how poor and how a rip off how bmw refuse to face up to these failures,, BBC watch dog done a tv programme on it contacted bmw and bmw denied any problem and that it was on a hand full of cars that were not serviced by them or in correct way or driver abused blah blah everything but the truth,, ie still 13 years down the road these engines are still doing their party trick ie timing chains that are mounted on the rear of engine that doubles the repair bill in labour, a chain that is to thin to take the loads from twin camshaft with vanos and vvt and a high pressure fuel pump and balance shafts all add load,
i had someone on here the other day thinking of buying a n47 diesel mini that after doing that search decided to treat it like a dose of the clap,
most stupid or most clever design bmw ever made depending if your the owner or the garage fixing it i guess