So new season , health back to normal ( heart scare wasn't heart) and I thought it would be good to get the bike out.
Washed it, charges it , put new fuel in and started first turn ( as usual ) , took it for MOT , passed with minor advisories RESULT !
Then pulled into a pub to buy tax online and went to start it again and it wouldn't start. FI was lit up

Breakdown came and put some jump leads on it (I had killed the battery by then) and away it went

Later in the week went for a 50 mile run , all good except just for 1 second , I lost power then back to normal .
still good.
Next day took it to work and at end of day, the FI was back . Grrrrr.
I got the code C41 from the dealer mode thing and need to know what I should test first.
Any people with this fault? Is it Common?
Any help would be appreciated.
Cheers