I haven't had bodies fail, but I've been using Sony DSLRs (Alpha) for
years and the damn lenses would break by themselves. The AF of the CZ
16-80 broke three times. After the second time it broke, it could not be
repaired anymore and I had to buy a new CZ 16-80 lens. A Tamron alpha
mount tele lens also broke (again the AF).
But all m4/3 lenses I've bought still work reliably after all these
years. None has ever failed.