I know this topic has been discussed for over a year now and no firmware fix has been released. This thread was started to see if the community can come together and find the root cause of the issue.
Issues that have been observed (only when wifi is active):
When the machine is powered on, eventually the screen will split
When the screen split is present, I get random blobs in my prints.
I cannot connect to Cura and start/manage prints from my computer
Here is a list of things that I have done so far:
Contacted Ultimaker NA Zendesk support
Support told me this is not a firmware issue, but instead is either the wifi card or Olimex board.
Both were replaced with brand new parts and the issue persists
Reverted to old firmware 4.3.3, and on this specific firmware
I do not witness any of the screen splitting issues
However, my automatic bed leveling is not working correctly
Support told me it was must be "primarily" a network issue.
My 2.4GHz SSID is separate from my 5GHz SSID
SSID does not contain special characters
Multiple 2.4GHz channels have been tested with identical results (split screen)
Contacted the distributor where I purchased my machine
Distributor worked with Ultimaker to get me another Olimex and wifi board
Observations supporting this being a firmware issue:
Most importantly, Ultimaker staff has confirmed this is a firmware artifact/bug and that they were supposedly working on a fix over a year ago (May 1, 2019).
Ultimaker 3 display broken after firmware upgrade
I see no screen split issues on 4.3.3.
All hardware that could cause this issue has been replaced with brand new parts on my machine, but the issue persists only on newer firmware revisions.
My guess is that this may be an issue where the newer firmware exposes wifi networking edge cases.
These issues are not present ever over LAN, but I do not have the luxury of running ethernet cables across my house.
Some people may consider the older firmware to be an acceptable workaround, but I do not. These devices were sold as machines that would get frequent live updates in the form of improved functionality and features. Now a firmware bug is causing my device to be unreliable, at best. The only reason I am resorting to asking for community help in root causing this issue is that I have no other reasonable recourse. Ultimaker support is not being helpful at all, and I've not been asked once to supply any logs or assist with troubleshooting the issue.
If there is nothing physically wrong with a machine, customers should not be expected to just deal with having to pick and choose features for over a year. This needs to be fixed.