Permanent repeating zfs chksm errors after 4 sec

Hi, i Hope i can have some insights in an error i get.
For some time now i have this weird behaviour of one of my pools where every 4 seconds i get 4 chksm errors on all disks. Ive testet all the disks with badblock switched the Sata Cables and the Powersupply. So i dont think it is a hardware error.

Apr 7 00:01:55 truenas zed[84614]: eid=305 class=data pool=‘BigData’ priority=2 err=52 flags=0x808081 bookmark=18446744073709551615: 388:1:0

I dont know where they come from but they do annoy me maybe you guys have a solution

How those disks are connected to the mainboard?

There is an LSI Pcie card with 2 controllers, where a second pool is connected as well, but which doesnt have these problems. Ive tried shuffeling these connectors around but with no difference

All drives on one controller would point at the controller being an issue.
Either its overheating (which LSI cards do)
Or its overheated an been cooked
Or its dying

Or thats what I would have said till you shuffled the connectors around. I suggest changing the cables on the knackered pool.

Oh - and post your complete hardware please

So the pool which gets errors is 5 Drives wide so i cannot use one splitter cable for the whole pool, but ive tried only 4 Drives with the pool beeing in a degraded State and i still have these 4 Errors every 4 Sec.
In the zpool status there is this error section where you are shown all the errors and here it says something like

errors: List of errors unavailable: no such pool or Dataset

For the Controller itself i would say that when all Drives of the 2 Pools are on the same Controller there are still no errors on the second pool

Ive tried to list all Datasets or anything that is not mounted but everything is mounted nothing is missing and no such pool or Dataset makes no sense

My complete Hardware is:

AMD 3600X
AsRock X470 K4
5x Exos 14 TB Seagate Drives (tho maybe one is a different Version of the Exos line)
LSI SAS 9300-16I HBA
2 DeLocke 4Sata to Sas Cables