Since I've been buying from Bitmain only as far back as 2016, I am not sure what their warranty period was before that time. But ever since I bought my first Antminer S9 12T back in the days, warranty was always 6 months which was unusual for me and made me really scared of their quality. At that time, I started buying new units and then selling them after 5 months of use.
Later when I decided that I should have a stable mining farm (release of S17 Pro and later S17+) I found out the hard way how bad those units are. And since then I haven't order anything from them.
This might change my mind as 12 month warranty has a bit of impact when you order new units compared to 6 months, even though I'd like them to have at least 18 or 24 months warranty (which is unlikely to happen), this is a good step in the right direction after all the bad things they have done in previous few years.
Ref:
https://twitter.com/Antminer_main/status/1325634556301508608
Quote from sale of Antminer S19Pro from their official website:
1. A 365-day warranty is provided starting from the shipping date. To avail this warranty a repair ticket must be generated by the customer on Bitmain's website. Overclocking the miner will void the warranty immediately.
This is related to all new Bitmain Antminers. Therefore, instead of writing about this in every thread which is related to their new/old hardware releases, I decided to open a new thread. However, if mods decide this is not the place for it, feel free to move it.