BMW 130i warps discs faster than I can change them?!

[Flood]

Had it for a good few years now, regular 130i without brembo calipers, brakes were worn when I got it, fitted eicher discs and pads, few weeks later it's shaking like a sh*tting dog when I brake over 60-70 mph.

Replace the bent ones under warranty, twice.

Fair enough, buy nice or buy twice and all that, left them for a bit, replaced them with brembo discs and better pads, these give me about a month or two and then the rear passenger side warps badly, warranty, front right warps.

Figure the issue could be misalignment in the hubs, over time I replace both front hub/bearing assemblies, one of the rear axles and both rear hub flanges. No change, still warping discs.

Totally at a loss, my calipers are in pristine condition and mostly new, I spend most of my life driving up and down the A19, the car doesn't live a hard life, very rare I stand on the brakes or drive particularly fast. All the suspension bushes are fine and tight, alignment is spot on.

I get about 500-1000 miles before a disc warps, I'll replace it, front right and rear left seem the worse having been replaced a few times, front left has warped once, rear right seems to have behaved it's self.

Any ideas??!!