The warp will come from the manufacturing process, internal stress in the plastic from the heat.
I would suspect due to demand they are trying to run at max rate so the process settings are getting abused, or the cooling cycle is compromised.
MY QUOTE] I can remember when I spent literally hours in shops that handled new - 'remainder' vinyl back in the 70's to the very early 80's . In some shops, you were even allowed /had the possibility of breaking its seal , to slip the vinyl out of its covers for self visual inspection,
As a result, checking say 5 to 8 copies - ' on offer' here &. there- starkly showed serious quality control issues : guaranteed -from bad manufacturing and handling issues.
"I.E : I do not know why ,but one particular examined vinyl example sticks in my memory for some reason. Though I was not seeking to buy, out of curiosity, I inspected a big remained batch of the U.S ( MGM Label) pressed soundtrack recording of the late 60's musical film "Goodbye Mr Chips" . All copies ... looked like a some worker at the pressing plant , with grubby hands ( after having a very greasy food lunch - that day) decided to leave his strongly made fingerprints and rub marks on all the discs.
Russian Melodiya vinyl discs also had a reputation being then, joking referred to, as pressed from the finest grade of Russian Govt. road bitumen .Another notorious label for bad quality and noisy surfaces - from back then was U.S Philips.
Frustrated U.S classical music buyers : were often known to go to the trouble and much added expense , importing individual copies pressed by Philips in Europe.