Rockster I have the same exact car as yours, only difference is color and probably miles, cause I know you've had yours several months before me...I haven't had any shift issues thus far, but something new has popped up lately, that would be the 1-2 shift in manual track mode shifts so hard it changes the radio station upon the shift which sucks cause that's my normal custom mode of driving..I don't like it in auto cause it holds 3rd to long (hangy and normal) at light throttle..with that said, what's your miles? I'm approaching 1500..maybe it's an age thing maybe a bug-a-boo in the software, hopefully as earlier mentioned your issue is with the paddle(s), please keep us posted
My Hellcat is a 2018 bought Feb. 17, 2018. Currently it has just under 13,000 miles, but if I drive it to work today and I think I will it will then have just over 13,000 miles.
Early on when I used the auto in manual mode I used the shift lever. But the lever is not well positioned for this manual shifting and in some form of mild frustration with this I began to use the paddles, primarily the up shift paddle. I found it easier and better to just let the transmission handle down shifts except in the rare times a downshift was needed to say pass a slower vehicle or to when I could just enjoy the acceleration.
I probably used the paddles at around 1500 miles but just as probably not very much. I didn't really get frisky with the car until the odometer hit 2K miles. At first what I recall seemed to be the problem was occasionally an up shift was not made when I pulled the +paddle. There was no message about the shift not allowed due to speed. The shift just didn't happen.
The behavior was so unexpected that I thought at first the fault was with me, that I failed to operate the paddle correctly.
But with experience and experimentation there doesn't seem to be any way to operate the paddle incorrectly. I tried operating the paddle in such a way to see if there was a way to possibly vary or even interfere with its operation in some way but mechanically the paddle when pulled just feels the same no matter how I try to affect it. Tugging back hard, or soft, pressing at some point down the paddle, as close the wheel as possible, off center, and so on, nothing I could do appeared to have any effect. Actually this is what I would expect of the paddle's design. That nothing the driver could do would affect either paddle's behavior, fail to trigger an up shift as long as the shift was not denied due to insufficient vehicle speed or in the case of a down shift would result in an engine over speed condition.
Might add that the position of the steering wheel doesn't seem to play a role either. Straight ahead or turned even turned slightly or closer to full lock the down shift instead of an up shift can occur and does occur at about the same frequency.
After some time though the "condition" worsened and while occasionally an up shift fails to happen more often and of course much more noticeable and disconcerting is rather than an up shift a downshift occurs.
The behavior appears to be independent of any other factors other than maybe it is less likely to happen when it is cold. While it doesn't get that cold here this winter, late last year, and earlier this year, it has been down into the 30's at night and often not getting to even 60F during the day. There was a spell of maybe 2+ months when the behavior was rare.
But with warmer weather now with overnight temperatures in the 40s or low 50s and day time temperatures breaking 70F the behavior is much more frequent. This suggests the temperature of the switch might (might) be a factor but it could be that the switch is just deteriorating and getting worse and temperature doesn't play any role.
Engine and transmission temperature do not seem to be a factor.
I think I have had sport mode possibly even track mode active at least once or twice but I have not exhaustively tested these modes or tried to use any of the features they offer.
Doesn't feel like a software issue. Really software only comes into play to upon a signaled up shift to deny this if the vehicle speed is too low for the gear being selected or in the case of a downshift being signaled to deny this if the shift would result in too high an engine speed.
The only software update my car is due for is the one to address the cruise control issue.
Guess my next step is to visit the dealer service department and see if there is a fix for this. I'm very reluctant to book the car in for this if there is not as it is inconvenient to me, disruptive to my schedule, to bring a car in. IOWs, to bring the car in for a problem for which nothing (at this time) can be done is just a big waste of my time.