Re: 147 2.0L intermittent power steering failure
Could it be the VDC kicking in? I once experienced this after driving along the M4 and then hit the South Wales country lanes. On one corner the steering felt as if someone had grabbed the wheel and I also felt a slight braking. The VDC light was flashing. When it happens first to you it's quite alarming but it's there to help you get a safe dynamic journey through the corner.Maybe your VDC is a bit sensitive? Not sure if this can be the case. Do a search on VDC on this site - there's bound to be a thread on the matter.
Good Luck and safe VDC driving!