Overburning with Nero does work but it really depends on the burner & the media as to whether you’ll get success as some burners won’t do it & some media can’t be overburned.
Sure burners can handle speeds of 40x & higher but you introduce more jitter that can affect CD players so for the sake of a few minutes most here burn at 16x to reduce the chances of that.
It would appear that overheating was a contributory factor here & it always makes sense to give the burner a chance to cool down before the next burn. Might lengthen it’s life as well.
BTW the ND 457x are pretty crappy burners & not up to NECs usually standard. I very rarely use my 4570. The firmware support from NEC has been very poor & these burners will only burn a few DVD media well. I much prefer my Pioneer 111, Benq 1650 & Liteon 1635.