My phone get in to boot loop twice if I remember correctly..months ago..
Last night..it suddenly pop into black screen when I go shopee farm...watering..
Power button don't respond or give u white screen with or without boot screen Poco logo sometimes..(after hold power button 10sec)

Power + down button = stuck at fastboot logo...
Search the web...and found the suspected cause..and now found your post..
Don't think it's worth repairing..
Bought 1 month earlier than you for rm869 from official store
gg....rip


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Headache 😔
🤦‍♂️ Still looking....don't know what to buy..I always use value for money phone.. on a budget..8xx max ...and change every 3 to 5 yr...last 2 phone is rm note 3 & rm note 7 (both 499)...this sudden phone break down really scared me..because xiaomis Poco curi curi cut budget use low quality soldering paste....all my data lost ...who knows which model of xiaomi or Poco have the same problems?
Feel more like planed obsolescence..
Other brands of the similar tech can cost up to 1300...looks like I don't have a choice...maybe rm note13 @899 or 699 lower ram ver...(I only play shopee ,& lazi games)

No..not interested in oppo vivo iqoo realme.imoo..oneplus..phones ..a company that creates so many sub brand to confuse consumer..if not xiaomi..maybe I would pick honor