AFTER RECEIVING A VECTOR PRIOR TO SOLDO ON THE RNAV SID; FLT CREW OF AN MD80 FAILS TO FOLLOW TRANSITION AFTER BEING RECLRED DIRECT TO SOLDO.

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AFTER DEPARTING DFW ON THE SOLDO SID; WE WERE INITIALLY ASSIGNED A HDG OF 080 DEGS AND TOLD TO EXPECT AN INTERCEPT TO THE SID EBOUND. NEXT CLRNC WAS DIRECT SOLDO. JUST PASSING SOLDO; CTR CONTACTED US AND TOLD US THAT WE WERE DEVIATING FROM THE ASSIGNED COURSE AND RECLRED TO INTERCEPT THE REMAINDER OF THE SOLDO SID. WE IMMEDIATELY NOTICED THAT THE FMS HAD DROPPED UIM AND ELD FROM THE LEGS AND THE ROUTING WAS SOLDO-SQS. WE REENTERED UIM AND ELD AND PROCEEDING ON THE CLRED COURSE.SUPPLEMENTAL INFO FROM ACN 699046: THERE IS A SOFTWARE PROB THAT EVERYONE IS AWARE OF REGARDING THE FMS DROPPING OUT WAYPOINTS ON DEPS AND ARRS. AS THE PNF; I COULD HAVE DONE A BETTER JOB BACKING UP THE CAPT AND CHKING THE WAYPOINTS MORE CAREFULLY. WE WERE ALSO SLIGHTLY DISTRACTED WITH THE WX RADAR AND AVOIDING BUILDUPS. LESSON LEARNED: BOTH PLTS ALWAYS VERIFY CHANGES IN THE FMS AND ON THE MAP. ALSO; PLEASE FIX THE SOFTWARE. WE ALSO FOUND OUT AFTER CALLING THE ATC SUPVR THAT THIS HAS BEEN A COMMON RECURRING PROB WITH THIS TYPE OF BOX AND SOFTWARE. ATC HAS A SPECIAL FORM THEY FILL OUT SPECIFICALLY TAILORED FOR THIS EXACT SITUATION SINCE IT HAS BEEN SO COMMON.