No i haven't opened a support ticket yet but i will.
Actually i found that when i am in my dirty presets the tuner is working properly (still have to play up and down the expression sometimes) and the big problem is when i am on my my clean presets and engage the tuner ( of course the input settings are right) ( i mention again that the tuner works perfectly when i open my helix for the first 5 minutes ).
This little trick saved me yesterday in my live performance so if anyone else has the same problem maybe this trick works ..