Probably best to talk to your American Eurocopter tech rep, but here's what our wrench turners suggest:
1. Likely mechanical interference under the floor
2. Spray-lubricate the servo input selectors
3. Uniball or swashplate friction tape may be balled-up (check 10 o'clock position on the swashplate guide)
4. Look closely at where the cyclic goes through the floor to the fork
I/C