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Just recently went through something similar on my 11 35i, I had to replace the tensioner pulley. While doing so I replaced the serpentine (driveshaft) belt and the other pulleys done there. No issue ever since I made the repairmen in those areas, hope this helps!
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2011 E70 35i MHD Tune Stage 2+ (CURRENT) Daily Driver
1989 R32 Skyline GT-R (CURRENT) The Hunter
2010 E90 335i 1M FBO MHD Tune (SOLD)
2009 E92 335i FBO JB4 G5 ISO (SOLD)
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