I'll randomly be working on a project and be moving about when suddenly, artboard 1 will change from portrait to landscape. Only artboard 1 and sometimes it will do it when I'm not even touching anything.

I consistently encounter the same issue whenever I work in Illustrator, as depicted in the screenshots provided by Dendy Herlambang.

Apple Mac mini Pro (M2).

It doesn't happen always. One document contains multiple artboards. Seems to affect those sized 1080x1920 pixels. Most of the time is pasting something around that artboard, but sometimes other object manipulation end up with that artboard rotating.

I'm on Windows 10 at work (22H2) running on an i7-4790, 16GB RAM, GTX 745 graphics card with latest drivers, 512GB SSD. Had the same problem at home running Windows 11 on an i7-9700, 32GB RAM, RTX-3060 graphics card, 1TB SSD.
There's really no specific step, or more likely I haven't found a pattern yet. Sometimes I just open a document with several portrait artboards, zoom out to see them all, and suddenly one of them just flips orientation to landscape. Other times, I'm already working with a document for some time and the artboard I'm currently working on just flips to landscape.
It's like Illustrator was reverting to some default artboard orientation (portrait to landscape for most of my 1080x1920px artboards) but I haven't found what triggers it yet.

It usually happens when you focus back to an element in the art board.

I am using Macbook Pro M1 with Mac OS 14.2.1 and Adobe Illustrator version 28.3.

Here is an example when I just moving some elements inside an artboard, then I press Cmd + Z (Undo), the artboard suddenly changed its orientation to landscape.

Here is an example when I experienced this, it randomly happens. Sometimes it changed the orientation itself even when I am just selecting some objects in an artboard

I also experiencing this issue, artboard constantly changing from portrait to landscape randomly, sometimes when I click "Document Setup > Edit artboard", sometimes when I select all element inside an artboard it randomly change to landscape. This is really annoying and really mess up my design elements when I use multiple artboards.

I am using macbook pro m1 with the latest os using Adobe Illustrator version 28.3.

It's happening to me almost constantly. Also with basic printing formats, like A4. It's becoming very difficult for me to work.

Sometimes it rotates the artboard next to it. It seems to happen when I paste an element to it.
This just started happening today.
Desktop version (28.3) working on macOS Monterey (12.6.7)

It does seem similar.

For me, it's just been when editing the height value numerically (not clicking and dragging to resize or editing the width value).

Somehow, with the 28.3 update, Illustrator started rotating an Artboard (especifically 1080x1920) every time I do something close. No commands needed. This is very annoying. Slows my workflow. Please, correct this.

Aaron, this seems new with the recent version...
Take a look at this report — does it feel similar?
http://illustrator.uservoice.com/forums/601447/suggestions/48122324

When I try to enter a new height value numerically for a square artboard, Illustrator swaps the height and width values.

I don't know if it is trying to force me into a portrait instead of landscape layout? That aspect of an artboard should be descriptive, not prescriptive.

For example, create a new document with an artboard of 800 x 800.

Then click "document setup", then "edit artboards", then type in a height value of "600" and hit enter.

For me, Illustrator consistently switches the width to 600 and height to 800.

This is unacceptable.

It could be linked to the error, but in my case it was very specific when using the mentioned command.
So far it has not happened, but I will continue to monitor the problem.

Thanks a lot!

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Podría estar vinculado el error, pero en mi caso si fue muy especifico al utilizar el comando mencionado.
Hasta ahora ya no ha pasado, pero seguiré monitoreando el problema.

muchas gracias!

Another report claims it just happens on its own, Artboard orientation changes from vertical to horizontal by itself: http://illustrator.uservoice.com/forums/601447/suggestions/48122324
Does it happen to you also?

Eduardo, a similar report has been filed just recently, Artboards change their orientation when "crtl + f" command: http://illustrator.uservoice.com/forums/601447/suggestions/48123233
Can you try and reproduce it? Does it feel like the same problem?

ENG
It is strange this error that has happened to me with the program, since simply by copying and pasting in front (ctrl + F) the artboard where the element is pasted suddenly changes its orientation to vertical, when you undo the action and do it again you can paste it without any problem.
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ESP
Es raro este error que me ha pasado con el programa, ya que simplemente al copiar y pegar al frente (ctrl + F) la mesa de trabajo en donde se pega el elemento cambia su horientación a vertical repentinamente, al deshacer la acción y volverla a realizar ya puede pegarlo sin problema.