This essentially says that the block the database read from disk was corrupt. If this is repeatable across a wipe-and-rebuild I think the most likely cause is bad hardware (disks, RAM, motherboard, …), bad drivers, or bad interaction between hardware, drivers and antivirus…
It’s able to fully index without a crash, when the other devices are paused, the error occurs once it starts trying to negotiate with the other connections.
Would that be the expected result of a hardware issue as well?
It’s especially strange(frustrating) that it was working 100% fine for about 2 years and now it can’t process it.