Xiaomi 4a gigabit edition disconnections and shielding

Hi all,
I'm having some transient wifi disconnections on a fresh install on this device which disrupt voice calls etc.
I know this device is not properly shielded. Both the above are mentioned in this thread:

I'm wondering what is the impact of lack of proper shielding and whether this has to do with the disconnections.
Is there a DIY way to shield the unshielded parts of the internal board as shown in the photo of the thread? What material should I use? Aluminium?

For me, it was most definitely the shielding. I had tried everything but nothing worked except making my own RF Shield and soldering it on. I tried the snapshot release, 23.X, 22.X. I tried using a higher quality power adapter, made sure no usb peripheral were connected, installed heatsinks and even a fan to rule out overheating issues but only after I made the RF Shield mod the the problem went away. The router has been sooo stable ever since I did that mod. Here's how it turned out:

Copper is so easy to solder on that it was was a breeze, the only time consuming part was bending the copper sheet into the correct size. I also installed thermal pads inside so that it also acts like a heatsink. I used a 0.3mm copper sheet btw.

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