LGT ON VECTOR FOR ILS APCH MISSED CTLR'S CHANGE OF ILS AND RWY ASSIGNMENT; HAD TO BE RESEQUENCED; FO RECEIVING IOE TRAINING.

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I WAS CAPT CONDUCTING INITIAL F/O OPERATING EXPERIENCE TRNING UNDER APPENDIX H TRNING. THE WX AT LAX WAS APPROX 700'/2 1/2 MI VIS. APCHING SMO ON THE FIM ARR; APCH CTL (124.5) TOLD US WE WOULD RECEIVE RWY 24R; LOC FREQ 108.5. WE DEPARTED SMO ON AN ASSIGNED 070 DEG HDG. APCH CTL WAS BUSY AND SEVERAL XMISSIONS WERE BLOCKED BY OTHER ACFT. WE WERE GIVEN A TURN TO BASE AND THEN TOLD TO FLY 240 DEGS TO INTERCEPT THE LOC. AS WE WERE GOING THROUGH THE LOC FOR RWY 24R; I TOLD APCH WE WERE TURNING TO 260 DEGS TO INTERCEPT AND THAT WE WERE GOING THROUGH THE LOC. APCH CTL DID NOT REPLY. APPROX 10-20 SECS LATER; I ATTEMPTED TO GET CLARIFICATION; BUT APCH CTL CAME ON TO TELL US TO TURN S FOR THE RWY 25L LOC; AND THEN THAT WE WERE CONFLICTING WITH TFC ON RWY 24R; TURN TO 150 DEGS (?); CLB TO 5000' (WHICH WE DID). I INFORMED APCH THAT WE HAD NOT ACKNOWLEDGED ANY CLRNC TO RWY 25L (109.9). WE WERE THEN VECTORED FOR AN APCH TO RWY 25L AND LANDED ON RWY 25 W/O FURTHER INCIDENT. APPARENTLY APCH HAD CHANGED US TO RWY 25L; BUT WE DID NOT RECEIVE (NOR HEAR) THE CLRNC. WE MOST CERTAINLY DID NOT ACKNOWLEDGE THE CHANGE; AND THE CHANGE WAS NEVER REISSUED. THIS IS BECOMING A CONSTANT PROB AT THE BUSIER ARPTS. AT ORD; ATL; SFO; DEN; LAX; SFO; ETC; APCH; TWR AND GND CTLS GET BUSY TO THE POINT WHERE THEY HOLD THE MIC SWITCH OPEN AND XMIT CONTINUOUSLY; W/O RECEIVING ANY ACKNOWLEDGEMENTS FROM THE AIR CREWS. THERE IS NOT AN OPPORTUNITY TO ASK FOR CLARIFICATION IN THIS SITUATION W/O STEPPING ON A XMISSION AND COMPOUNDING THE PROB. ALL OF THIS OCCURS AT A TIME WHEN THE FLT DECK IS AT ITS BUSIEST: WHEN RADIOS ARE BEING TUNED; CHKLISTS COMPLETED AND GEAR AND FLAPS REPOSITIONED. AND; WITH THE INCREASE OF 2-M CREWS AND THE HIRING OF LESS EXPERIENCED CREWS IN THE FUTURE; WE ARE GOING TO HAVE PROBS IF THIS CONTINUES. WE ARE GOING TO HAVE TO GIVE THE FLT CREWS A CHANCE TO ACKNOWLEDGE AND/OR CLARIFY CLRNCS. THE PROB IS GETTING WORSE!