Get your Gear Oil checked? Seems like Gear Oil issue. Please note that your gear requires CVT Transmission Oil, not regular ATF Transmission Oil. i would recommend going to nearest Toyota Service Center.
Check gear oil
Cvt needs flushing. Pour toyota cvt fluid.
Salam,Sir main bhi same problem face kar raha hun. Kia hal nikla aap ki problem ka ? Kindly share kijye to mj mechanic ke pass kaam karwane me asani ho.جزاک اللہ