You can add me to the list for Florida. I've been experiencing this for over a year. So naturally that's when I began loosely following this thread. At this point I just drive around with a code reader in the console and clear it as it pops up. I tow a 19' boat with my GX460, maybe like 3 times a year. Nothing crazy. Otherwise just city commuting and looking cool.
I don't track the frequency of the codes per se, but I'd estimate that the crazy light show pops up every 4-6 months. It's definitely more prevalent when there's a chill in the air, and we had a little cold snap here so it happened twice last week. The truck drives GREAT otherwise - no perceptible tranny problems - good kick downs, very smooth shifts, never been locked out of reverse or any other gears...
Like most people in here, when it's cold out (and I remember to do so), I use sport mode and shift myself until it warms up. I've never had the codes pop up while doing that, but it is a pretty small sample size. My issue is always with solenoid D. Even when I clear it out, there's a hard code that always remains in the background. My buddy has TechStream, I just haven't organized getting that code wiped since it doesn't bother me day-to-day.
I have flushed my fluid and added a Hayden, in reaction to the lights but it keeps happening. obviously. I figure i'll be swapping in a new tranny at some point, but for now I'm gonna keep doing what I've been doing until it gets intolerable. At the end of the day, I'm honestly not even that mad about $3k for a new transmission - since I can swap that out myself - seems like it could be a lot more expensive than that. Did I read correctly that the new replacement trans from lexus comes with a torque converter already installed?
If so, that's actually kind of a steal IMO. And I'd almost rather swap the whole thing than to chase around all these parts and deal with the constant disappointment/fear that they may not solve it anyway. Can you tell I'm a seasoned car guy and I've been there too many times? Bc I have

Automatic transmissions might as well be black magic to me! I don't know jack about how they really work.
I guess I should mention the vehicle and situation: 2012 GX460, ~165,000 miles currently. I picked it up with about 148k or something like that. Not sure when the codes started. I bought the truck used from a dealership about 2 years ago, so it could be the reason the previous owner turned it in! who knows??