This thread is puzzling.
The fact that simultaneous failures (or failures within a short period of time) occur on multiple hard drives could suggest a faulty batch, but I find andrzejls's theory about the hardware surrounding the hard drives more plausible.
However, it's very rare for the same thing to happen on two different servers at the same time, with different hard drive models in both servers. This invalidates any theory related to batches of hard drives with manufacturing defects. It also invalidates the theory that some server component, such as the power supply, could have caused this, since it has happened on two servers with two power supplies and different hardware.
So, analyzing everything that's been said, this seems more like a mystery movie than anything else. I can think of a few theories:
1. That you're pulling our leg. If you were a relatively new forum user, that would be a possibility, but considering you've been a forum member since 2018, it's unlikely, so I'm ruling it out.
2. You're using similar hardware on both servers, and there's been a recent update that harmfully affects that hardware. For example, the same SATA port expansion card. It could be, but I'd be surprised if it only happens to you. So I'd rule out this option.
3. Sabotage. You say these servers are in a company. Has it occurred to you that a disgruntled employee might be kicking the servers when no one is looking? That would explain it. I think I'll stick with that option; I can't think of anything else.