SIM network and wifi constantly disappearing - Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe

I am using Redmi K20 Pro.
It's seven months probably I have purchased.
Everything was good. I was using MIUI.EU version 5months maybe. Suddenly yesterday when I pick my phone. It was a bit heated. Not even closer to how the phone heat when I charge this.
I unlocked phone, the wifi and sim network showing and despairing, continually doing this. Then the network is gone.gone means totally gone. It was 5:00 AM closely, so I go to sleep.
Today I flashed the fastboot ROM; now, the network is work sometimes and wifi. But still, I am facing the problem.
that time was totally gone. now sometimes I get the network and wifi and then sometimes disappearing.
Please let me know what can I do now? How can I fix that?
Thank You
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Hello, guys,
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Thank you for you time.

Question How to fix hotspot error?

I got this Mi 11 3 months ago ( second hands ), it seems normally until 5 days ago, it can't turn on wifi and hotspot !, I'm tried many tricks to fix this like
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:xd xiaomi has noted this wifi problem in china

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