Raise N2 extrusion problem

[Moi]

Hello,

we run into problem with our brand new 3D printer. It's a n2, in less than one month the two printheads have been clogged, not all the time, always at the same time of printing. We already have two raise 3D printer, n2 and n2 plus for about 1 years, no problems with them. We print all day long, all the week.
Can you help me with this problem ? Is there a new version of the hot end ?

Thank you.