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I haven't had a chance to look at mine yet, kind of nervous about what I'm going to find.
I'm also trying to work out if I want to repair it. Knowing that it can fail like this makes me a bit unsure. This summer is going to be spent touring, and I don't want to risk it failing when I'm in the middle of nowhere.
Kgrev-
I just reread your previous comment and realised our issues are probably different. Mine only occurs when the actuation arm is right at the extent of it's travel, something that wouldn't happen on the road as the pads would've long contacted the disc rotor.
I'm not stripping mine down anyway; I've opened an ebay return as three of the pad adjusters are rounded off.
Something else I've remembered; once when I stripped a set down previously, I got the cams mixed up. They're different and need to go together a certain way (which is obvious), but if you're rushing it's possible to get them mixed up. I remember this made the brakes feel weird, possibly as you describe. I noticed immediately and reassembled them properly. Perhaps who you bought them off has done this?
macaroon
Did you solve this? I've just bought a second hand set (they're the Spyre C version which are OEM but identical apart from the colour) off eBay and they suffer this exact problem.
I think it's just one of the (three) bearings popping out of the cam as the piston sits at a wonky angle when it does it.
Debating whether to strip them down and clean them or send them back; they feel pretty rough. If I strip them down and they're shagged, is it too late to then return them for a refund? Anyone know?