Granular dirt in the loop could also destroy a pump. So, when you take the loop apart, better be safe and take the time to open the water block to check for possible contaminants. And if it is easy to open the pump, have a look in there too to further get to the bottom of this defect.
Does anybody know whether XCSP use real Laing D5s, or only some wannabe D5 clones?
My first pumnp was a DDC-like pump in a modular AIO from EKWB. I first expanded that AIO with a GPU waterblock, then with a second radiator, and then the pump broke down and killed the CPU with it. (And the plexi top of the CPU block which I had at that time was killed too; basically the fittings fell out of their threads when the loop overheated. For this reason I now have no plexi in my loops anymore, except for the reservoir shafts.)
Now I have four EKWB D5 pumps, all of the PWM controlled type; two with reservoir top and two standalone with acetal top. The first of these pumps I believe I bought a little less than two years ago. It is now working in my triple-GPU computer with CPU block, three GPU blocks, internal 280 mm radiator, external MoRa 360, and quick disconnect fittings between case and MoRa. The D5 isn't having an easy time with a large loop like this, but is adequate.