My wife has a 2010 1.4 Evo Turbo multiair. It's been regulary serviced. It's developed an issue where it will suddenly loose power for no apparent reason. Following on from that, the next time it is switched on, the EML will come on with a code of P0069. I've changed the MAP and MAF sensors with no effect.
The only thing that stands out to me is on Multiecuscan there is nothing showing for Boost Pressure Signal. So I'm thinking that might have something to do with it but haven't a clue how to go about finding the cause and sorting it.
I took it for a 20 mile run with the laptop on and the BPS was zero all the way. Pic is from it sitting at idle today.

Have a look here, it may help or give you some information how to make a proper diagnose:
https://www.fiatforum.com/bravo/462179-possible-boost-leak.html