After three consecutive Rugby Championship defeats, the Springboks have been measured against their main southern hemisphere adversaries and some of the playing personnel have come up short. The worry for the Springboks is that individually the players are making too many mistakes. All of a sudden, players in critical positions are committing plenty of basic, unforced errors. These include knocking the ball on, kicking out on the full and delivering poor passes.Locks Eben Etzebeth, Pieter-Steph du Toit and Lood de Jager have been brilliant for the men in green and gold, while No8 Warren Whiteley has increased his value in the absence of the injured Duane Vermeulen.However, some of the backline players, particularly Faf de Klerk, Elton Jantjies and Johan Goosen, have made a plethora of unforced errors, which has served to undermine the Springboks' endeavour.It's fine boasting X-factor and being able to dazzle on attack, but the halfback pairing of De Klerk and Jantjies - who play in crucial decision-making positions - needs to understand that the consequence of making mistakes at Test match level is very different to Super rugby level.Super rugby is more forgiving of mistakes because matches are generally high-scoring affairs and opportunities present themselves often.However, against the All Blacks, the Springboks conceded field position owing to unforced errors and were duly punished.If you are inaccurate in your execution against the top-ranked All Blacks, you are as good as dead. And, if De Klerk and Jantjies - whose self-confidence is shot - cannot find a way to limit the number of unforced errors they commit on the international stage, they will be branded as competitive Super rugby players who are not good enough to perform consistently at Test level.If we compare the New Zealand halfback pairing of Aaron Smith and Beauden Barrett, it's telling how few unforced errors they make during a match.I believe that is the fundamental difference between the two teams at this point.I'm aware that the Springbok players aren't making mistakes on purpose and are fully committed to the cause, but the net effect is still an unforced error.As a professional coach, you cannot say to your players: "Boys, let's try to limit the number of unforced errors we make today," because you either make unforced errors or you don't.There are times, as a coach, when you will decide that the only way to limit unforced errors is by eliminating the culpable individuals from the match-day 23.I foresee Allister Coetzee making some personnel changes, particularly in the back division, ahead of the Springboks' next Rugby Championship assignment, against Australia in a fortnight.He may consider playing Rudy Paige and Morné Steyn at Loftus Versfeld, not least because his incumbent halfbacks have let him down with a catalogue of unforced errors.However, another reason he may opt for Paige and Steyn is to introduce a different playing approach.Meanwhile, Patrick Lambie could mark his return off the bench after recovering from the symptoms of concussion.Lambie is a well-rounded player, and the fact that the Sharks flyhalf doesn't make many mistakes between the four white lines will benefit the Springboks...