Dc'ing in VT and SK

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I dc at the end of mech, at the same part. Sk its at the end of driving and VT its on twins at grab orbs for healing and keeper. Every time no questions ask. I run dungeons on f8 and do pvp for hrs with no dc's. I dont understand why this is happening or how to fix this small bug. anyone got any ideas? i tried lowering my settings, changing clients to and from 32 and 64, and updating my graphic card. Anything i try it always dc's me, end of driving on SC and grab orbs at twins in VT.