Raspberry Pi drops Wi-Fi while openig UI

Hi everyone,
Unfortunately, I’ve encountered a rather annoying issue over the past few days. Everything was working fine until recently, but a few days ago, when I turned on the Pi in the morning and tried to open the UI, the Pi’s internet settings were gone—it disconnected from the Wi-Fi, and even a reboot didn’t help. I reinstalled the system, but the same thing happens with a fresh setup as soon as I reload the flow.
I tried not installing the external libraries in Node-RED right away, but even then, as soon as I try to open the UI, the Pi’s network interface crashes, and only a full reinstall fixes it. I have no idea what could’ve changed overnight—when I shut everything down in the evening, it was working perfectly.
The problem is, there’s a lot of work in the current project, and I need to continue—it’s not something I want to or even can abandon, but I’m stuck and can’t make progress like this.
Has anyone experienced something similar?
Thanks in advance for any help!

When you say "UI" - do you mean the Editor or one of the Dashboards?

Also, assuming you are using an SD-Card on the Pi, do you have a spare? Feels a bit like a corrupt card.

And before you do anything else, make sure you have a backup of the .node-red folder.

If the above fails, you might want to consider is the Power Supply you are using for the RPi. Is it rated high enough. The load could be dragging the supply down and causing erratic drop-outs of the RPi.

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