My bike looses power intermittently while riding at any speed whether hot or cold

Possible Intake boots leaking causing a mistfire and running lean. Make sure you run the harley plugs. Is there a power commander on it ? If you do they are known to go bad and mess up runablilty.
This may be a long shot but since you have the magnelli marelli fuel injection system , you might need a hot/cold idle adjustments and clean out the inside of the throttle body.

I had a problem like that on my 2003 ultra classic. turns out there was a recall on some electric block in the fairing. It was a main connection power block kinda thing. Anyway they replaced it and then it never happened again.

it would ride a while on a hot day 25 min freeway and then just shut down. wait and cool down and it would restart.

I hope this helps.
JD