My ROG 6 it's only 2 months. but i face this issue.
the left trigger not working at all,
already restart and also clear cache on armoury crate.
when i lil bit bend the phone, the left trigger respond. i think i got the bad one version
Hello, it sounds like a hardware failure.Make sure to contact your closest ASUS Service Center so they can take a look at it.https://www.asus.com/support/service-center-location