Sounds to me like your EBS (engine braking system) or ADC ( active decent control, if turned on) are not working. A better description of what you feel, hear, ETC, would help to understand what you mean by "slips out of gear". I've also read somewhere, on this site I believe, that some of the machines destined for "flatland" areas don't come equipped with EBS because most people don't need it in these areas. I don't know if this true or not. If so, it could explain your feeling of "slipping out of gear".
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