I've had mine for 6 months, no hiccups. On weekends, its on for +- 8 hours a day, without any issues ( TX-NR 609). In durbs, my dad has the 606, sasme story :) Could just be a bad batch.
I used to have a Yamaha RXV 2600; hated it and sold it at R2k less than what I paid for it 2nd hand...