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sirgromit39f9dc
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August 17th, 2025 15:35
U4025QW, MacBook Pro, constantly disconnects
I am experiencing frequent disconnects when using a Dell U4025QW with a MacBook Pro (Nov 2024 with Apple M4 Max). These disconnects happen as often as a dozen times a minute or as little as few times a day. These disconnects lead to an immediate logging out of MacOS. This does not occur at all with my much older MacBook Pro (2017 Intel model). I am connecting the U4025W via an Apple Thunderbolt 5 cable, which I have further insulated with snap-on ferrite cores. Display and MacBook Pro are all on the latest firmware/OS versions.
I believe there is interference from BlueTooth devices (perhaps from my keyboard and mouse) causing these disconnects, but I am at a loss as to why they only happen with this specific configuration.
Could this be a faulty display? I have seen other reports of Mac users with this issue but have not found a specific solution. Any help would be greatly appreciated.
(edited)
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Posted March 30th, 2026 19:32
Final followup from me on this:
After updating to the latest macOS 26.4 and then using both of my Macbooks (Pro M3 and Air M5) throughout the weekend and today, using a 240w TB5 cable, the issue has not happened. It seems that the latest macOS update solved it for me.(edited)
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Posted August 10th, 2026 15:43
@vtka nice, this has worked for me so far as well. I'm using the Thunderbolt 3 cable from Pluggable.
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Posted October 10th, 2026 21:19
I too have switched to the Thunderbolt 3 cable from Pluggable and it seems to have solved the issue. I also run on magic power cable power (which used to fix it, but not now it seems), and stopped using a surface bluetooth mouse, both of which might be contributing factors.
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Posted August 25th, 2025 20:50
At the suggestion of a poster on Reddit, I switched to a Thunderbolt 3 cable and can confirm I've now gone several days without a single disconnect. I haven't had significant extended use yet, but I'm comfortable enough to think that this has fixed it! There appears to be some kind of compatibility issues with this display (which is Thunderbolt 4) and M4 Macs (with Thunderbolt 5). Using a Thunderbolt 3 cable would knock it down to Thunderbolt 3 specifications but my understanding is that there shouldn't be too much of a difference performance or functionality-wise with M4 Macs and this display running at Thunderbolt 3 specs. I hope this helps someone in the future.
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Posted August 26th, 2025 12:42
Please verify =
- Using the provided U4025QW 1.5 M Thunderbolt 4 Active cable had the disconnect issue
- Using unknown length Apple Thunderbolt 5 cable had the disconnect issue
- Using unknown length/manufacturer Thunderbolt 3 cable did NOT have the disconnect issue#IWork4Dell
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Posted August 26th, 2025 15:00
- Using the provided U4025QW 1.5 M Thunderbolt 4 Active cable had the disconnect issue
This is correct. I had the disconnect issue using the included Thunderbolt 4 cable.
- Using unknown length Apple Thunderbolt 5 cable had the disconnect issueThis was the Apple Thunderbolt 5 (USB‑C) Pro Cable (1 m) and it had the disconnect issue.
- Using unknown length/manufacturer Thunderbolt 3 cable did NOT have the disconnect issue.I have not had the disconnect issue since switching to the Belkin Thunderbolt 3 USB Type-C Male Cable (3', Black) cable.
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Posted August 26th, 2025 21:34
I would also like to point out that I did not have this issue until I switched my computer from a 2017 MacBook Pro (which only supported Thunderbolt 3), to the current 2024 model (which supports Thunderbolt 5). The older MBP worked with the included Thunderbolt 4 cable.
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Posted September 14th, 2025 10:21
I have exactly the same issue.
U4025QW is constantly disconnecting with:
- original 1.5 M Thunderbolt 4 Active cable (provided with monitor)
- Apple 1 M Thunderbolt 5 Pro cable
Issue is not happening when I use:
- Thunderbolt 3 cable.
I do have Macbook Pro M4 Max.
Is there any coming fix for this @DELL-ChrisM2? I don't think using TB3 cable is real solution to this, then we are bottlenecked and we cannot use full potential of this monitor.
Thank you!
(edited)
DELL-Nat M
Community Manager
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Posted April 2nd, 2026 13:48
Hi all,
A few users have already reported this in the thread, but for those who may have missed it, please update your Mac to the latest version (26.4). This update should resolve the issue.
If you continue to experience problems after updating, please let us know.
#IWork4Dell