Hello guys, i need some help with my 2010 octavia I.6 MP1

I changed the fuel pump recently because the engine would jerk before loosing power on short journeys. This was after they serviced the injector system and the spark plugs changed. the engine stopped jerking after this, but after a day, would not start. The workshop discovered a broken fuse near the steering wheel, and after changing the fuse, the engine started. However, the problem is now recurrent. they think there may be a problem with the CEM. 

i need suggestions please because the CEM is expensive and i am trying to avoid trial and error.

 

 

 

 

First of all, if you can get it on VCDS to see what logs are being brought up. it will help a lot in narrowing down the fault.