I do remember BMW has a history of issues with clutches when hot. I once borrowed an E36 from a colleague (back when they were current), and stuck in a traffic jam it had similar issues but also slipped at times when it was hot.
Reading back in this thread, at lease one post talked about things improving after a track day. It could be that the clutch in the M2 (which is shared with the F80 F82/3 M3 and M4) doesn't appreciate being used as a daily driver in stop and go traffic, and perhaps benefits from an 'Italian Tune Up' once in a while.
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2018 ///M2 LCI, LBB, 6MT...
Current Performance Mods:
CSF FMIC, ER CP, Fabspeed Cat, Aquamist WMI, GFB DV+, NGK 97506, BM3 (Stage 2 93 OTS), CDV delete, UCP, M2C/M3/M4 Strut Brace, M3/M4 Reinforcement Rings
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