FAQ entry for this (filling in for Tony smile

http://www.riocar.org/modules.php?op=mod...;faqent=263#263

There is code in the firmware, and also hijack to try and deal with how the rotary encoders degrade over time, termed "debounce". If you don't have hijack installed (and stock upgrades will wipe it out), may be worth putting it on to see if it helps before going with the hardware replacement.