I drive a 2018 Hyundai Elantra Sport (yes wrong car ahaha) with the same 6MT and 1.6L as the Veloster turbo and R-spec, I figured more people would be familiar with my issues here since we share parts.
Car only has 25k miles on it and I've had it since early February. Since I got the car, but not sure when exactly this started, when the car is cold reverse gear doesn't seem to engage and sometimes I have to give it the 'ol in and out trick to get it into gear. A couple times I thought I've had it in gear and while letting out the clutch slowly notice my shifter pop out of reverse and then it goes into reverse no problem.
Lately however reverse gear has been getting consistently more annoying and on 2 separate occasions I've gotten pretty bad gear grind (not moving or rolling whatsoever, foot still on the brake) however after the gears grind and I got back into Neutral, it goes nicely into reverse and I can back out of my driveway (this only happens at home after the car has been sitting and is cold) and it doesn't do it again after work or wherever I go (I mostly back in now too.)
Is there anything I can do to try and mitigate this issue, maybe it's an issue with the reverse lockout or the gate itself? Should I take it into Hyundai before I gets worse? I've never once shifted into reverse while moving forward or shifting out of reverse into 1st while rolling back. I go the extra mile to try and not damage the trans besides double clutching lol, so I'm really at a loss other than to just take it in. Im hoping it's just a cable issue or something stupid, every other gear is fine, no grinds, not anything out of the ordinary, I don't beat on it or drive it hard when it's cold. Really bothering me.