Install antivirus and scan for malware infection. Remove unnecessary programs. Also look in the settings for startup applications, if there are a lot of them, then remove half from this list.
If there are no results, then you need to reset the system. But then all your files on your phone will be deleted.
Reason 1: Malicious firmware or OS (This firmware or OS generates scripts that force the phone to calculate. Recommended: check with Kaspersky, Nox Cleaner, Avast, Eset antivirus.) Reason 2: Moisture (closes some contacts. Fix it: send your smartphone to a specialist for checking, but before that, turn off the power and remove the SIM cards, memory cards and battery, if possible.) Reason 3: Malicious application (the same reason as 1) Reason 4 : If the phone is more than one year old, the processor and battery age for new programs, games and even the OS. (Replace your smartphone under warranty or change the battery and processor) Reason 5: Many applications are running in the background. (Correct: click on the recent button and remove the tabs) 6 reason: you use your smartphone too much because of this, the processor may heat up. (Correct: download the antiviruses that are listed in reason 1) reason 7: Shorted contacts that heat the processor. (Replace the smartphone under warranty or send it for repair) 8 reason: Some parts are missing. (Fix: Send smartphone to master.)
We recommend that you read the article on our website, where this problem is described in detail - https://fixunit.ru/greetsya-honor-view-20 (a photo illustration of the solution to this problem is presented)
If there is no time follow the link and read. We can briefly describe here the main causes of the problem, methods of solving this problem and the diagnostic steps. Save time and only need problem solving? - scroll down to the bottom of the answer.
First, check your smartphone for viruses, preferably with antivirus software from well-known companies (Kaspersky, nod32, drWeb). Often the problem is related to the installation of malware that performs actions from your phone in the background - parsers, ddos attacks, manning, etc. (what the intruders have enough imagination for)
Often users do not pay attention to what actions they allow the installed program on the smartphone (monitoring geolocation, access to photos, scanning itself, etc.)
Modular part of the device
your battery to retire? :) You can use various applications, but the data in them may differ or you can measure the number of microampere hours transmitted to the device (you need special equipment) There is an easier way:
Detailed instructions here https://phoneoff.ru/instruktsii/xiaomi-silno-greetsya
There can be many reasons for this behavior of a smartphone. But they can all be divided into hardware and software. Let's look at a few of these.
These are just a couple of reasons, you can read more here.