Transmission judder at ~1500rpm on Auto

Kuddy

Buick Newbie
1
0
1
Buick Ownership
2016 Regal Premium1
Hi All,

I've just noticed I get some form of judder from the transmission when in fully auto mode at at around 1500rpm. It's as if its trying to repeatedly swap between 5th & 6th and can't make up its mind. If I put it into semi-auto mode and leave it in 5th or 6th, at the same road speed it's all fine.
Does anyone have an idea of possible issues from those symptoms please?
It's a 2016 Turbo with 67k on it.
 

Eilustre

Buick Newbie
128
21
18
Maryland
Buick Ownership
16' Buick Regal GS "Ebony Metallic" & 17' BMW M3 F80
Thats a first, i've never used full auto unless i'm on the adaptive cruise control and i've never had issue's with any shakes in the shifting. i've always put it on manual mode 100% even in snow conditions (when it happens) I'd let the dealer take it and let them drive it and diagnose it
 
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