Discs themselves - DO NOT WARP, unless there are very poor manufactured items
the Warping comes from small amounts of built up pad material deposited on the disc surface, subsequent brake applications deposit pad material in the same place, until it starts to feel to the driver as though there is an issue with the disk
i suspect that many of the replaced disks have been with Ebay products, Ebay and some motor factors are flooded with Fake Mintex discs
the possibility of a hub issue are very real, however as some have done, using a run out gauge on the hub, and then with the disc fitted will identify this issue
more often than not the issue is with the caliper, either corroded sliders, corroded pistons or crap build up on the caliper parts that the pads are located within.
most caliper rebuilds ive seen have been very suspect, and short of completely refurbishing the caliper, have never solved the problems, always consider other causes before you believe what a parts fitter in a garage tells, you, the suspension on a modern car is quite complex with finite tolerances which wander as the components wear
there are many reasons for shudder or breaking issues, non are really caused by warped disks