I bought some Magura MT Trail sports in September of 2017, and recently they've been acting up. My last ride had about 3 flats from different people, and we stopped each time. Took us about 5-10 minutes to get back riding again, and by then my brakes would have not much bite or anything, but after 5 minutes would feel alright- but not perfect.
Brake pads are fine, so are the rotors. So maybe bleed the brakes? Thanks.