I had a similar thing happen. At any sign of heat chunks of rubber would come off and after awhile the inner side of the tire delaminated. Once that happened I ditched them for PS4S.
A little too much negative camber in combination with this bad tire will get you a result like that.
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2016 X3 35i |M-Sport|Megan Racing Coilovers|FBO+|BM3|Jordan Tuned|Valvetronic Designs|
1998 750iL V12|2017 440i|2019 991.2 GT3RS Weissach|2019 Model X|...and some others
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