Sure this should be covered under warranty, I had just replaced my front diff because of this same problem.  My unit was out of
warranty by 6 months and I still got it replaced free of charge. After a bit of back and forwards with my dealer and CF Moto they came to the party as I think they're aware this is a major problem and not a user fault but a manufacturing fault. I pulled my new replacement diff apart to check the bolts that have been locktighted in and marked as that they had been torque (Black pen line over ever bolt) A+ for Cfmoto to supply me with a replacement diff without a fight!  I would go back to your dealer and say hey...

Anyone else had a problem with the Brake Fault Warning Indicator not going away, I have checked and added brake fluid and still showing.

The manual says:

Brake Fault Warning Indicator
This indicator displays when brake fluid level is very low. Add DOT4 brake fluid and contact your dealer. Low
brake fluid level may lead to air in the brake system, causing brake fault and lead to serious accident.

Do I have to reset the warning somehow, My local dealer said that it might be the ABS and theses no reset...  (I am 99% sure it doesn't have ABS) So you can see the crappy support I get in New Zealand...

Has anyone else had a problem the the drive chain indicator disappearing, This happen when changing between two, four or front diff lock. Doesn't happen all the time, about two or three times in a days riding. also happening both in eco and power mode. can normally get it back by switching between 2 and 4 wheel drive a few times. I not sure if it is staying in 4 wheel drive or not....

locked differential problem.  The fault was in the front differential, a ring gear screw came loose and blocked it as well as breaking the differential cover.  Longer bolts with a nut on the end are going to be put in.  and the rear will be disassembled and the same operation will be done.  We think that the guarantee will take care of it because it has had more similar cases.

1500km 99hours Mine has just done the same thing. Out of warranty... crap one year warranty in New Zealand, Would advise that these should be checked yourself, as it doesn't seem like cfmoto check them...