had similar issue occur 4-5 times as revs increased (without going hard). Sometimes in D mode and sometimes manual. No smoke or any other obvious issue. Turn engine off and on again and all error messages get reset and power was restored.
However, last time the messages have been reset but the orange engine light is still on and power appears to be still reduced.
Anyone else know about this issue (late standard 2007 E60 M5 with 80,000 kms now)