I would check to make sure nothing is "hanging up" in the tank.
Then you can use some Silicone spray on the handle pivot.
I have a recently installed Toto Nexus. The flush handle on the Nexus points straight down so that it must be pulled towards the operator to actuate. The flush now sticks at the 90-degree position but can be pushed back. I feel resistance while pushing it back. There is the usual nylon threaded assembly in the tank. Is this flush handle behavior something that others have experienced, and if so how is it fixed?
Thanks Terry. I used some silicone paste around the metal rod where it goes into the nylon assembly and it worked a treat!