Yes it does happen, the bearing will fail and you never know it because the noise it made to warn you was too far away.
Also if it just broke off the mounting bolt, that would have been one of those defects that just happen to get past QC.
Once fixed , you should never have this issue again, Sorry for your inconvenience.
Dan & Loretta, US Army Retired Aero Scout Pilot
2012 Fleetwood Providence 42P Class A/DP
Spartan Chassis, 8.9L Cummins 450HP