Sorry to hear your didn't last. Mine...it has been 2 years and still no problems. Do you think it may be your soldering job? Your solder should look like mine.

Compare photos on page 1.

There is no other part in the FSR that fails other than solder and the motor drivers. Usually the only reason the motor drivers fail is due to the solder, so it's kind of a circle. The biggest problem here is the pad area around the driver is not big enough. This is why the solder area is larger in my rebuilt FSR.
If you can not make the solder job look like my picture, the FSR may not last. The connections get very hot (driver transistors) so its imperative the solder flows properly.

What ever your solution, I wish you luck