Gear box and cutting out

Did you replace the hydrulic release bearing at the time of replacing your clutch ? If not, I would say thats your problem. The cutting out is probably your throttle body needing cleaned out or if not, it might be the wiring or your crank sensor but I would say that it just needs cleaned out.

The macanic did change something else as well as the clutch but not sure what it was? Also this morning my car cut out but then came straight bk on again without me turning the key???? If i got it cleaned at a garage would it cost must??