After that one occurrence where my 6 year old Android 📱 suddenly got it's own original 🔋 just inflated by itself in the last year which I was able to troubleshoot it, but then in this year, it's own performance suddenly went totally dropped where my 📱's entire old Android 9 (🥧) operating system just lagged horribly. Seriously, it's own entire operating system literally did so because I was once opened one of the random apps which I rarely used it for a while, but then it suddenly led into the aforementioned problem itself which I couldn't even get rid of it by myself... Well then, it's time to find the actual truth about how come if it suddenly occurred initially like so, until how I was able to troubleshoot the problem itself later on.
As what I clearly mentioned just earlier, I was once opened one of the random apps that I rarely used it for a while (for this case, it was one of those random floating browser apps that I was officially installed on it from the Play Store). The reason about how come if I decided to open the aforementioned app itself, it's purely because I was so bored, simple as that... However, right when I demonstrated the app's key feature of it, instead of working properly as what it should be, it just caused my entire 📱 just lagged absurdly by all of the sudden. This particular sudden total lag problem literally existed, even if I already uninstalled the aforementioned app that probably caused this to occur initially. It also made the matters worse, no matter if I kept restarting it numerous times, deleting unnecessary files on it's own internal storage, installing some antivirus and cleaner apps on it, or tweaking some stuffs on it's own settings (precisely on it's own developer options section), this particular problem always returned by itself after roughly several minutes depending on which apps or mobile games that I opened (ranging from those of the light ones, until all the way to those of the heavy ones), or on the worst cases, it occurred by itself during it was on standby. During this occurred, it literally struggled severely to open almost any apps or any mobile games that I tried to open them specifically on it (which either they went unresponsive or they just crashed instead), and so for it's own System UI itself. It also caused my 📱's back part of it went overheated as well, but it was mildly less compared to those times when it used to equip with it's own original 🔋 that got suddenly inflated in the last year though.
Even if this lag problem existed, but I just found out about how come if my 📱 suddenly did this by all of the sudden. It turned out if certain system background apps literally bloated almost my entire 📱's RAM for severely odd reasons, which I was able to check it from one of the options of it's own developer options despite it's unresponsive state that it had, specifically right during I tried to access the aforementioned section itself... However, I was able to fully troubleshoot it by bringing it into the same service center where I used to replace it's own original 🔋 with the better one in the last year, by simply resetting it's own entire Android operating system itself back to it's factory settings for relatively cheap price (which was exactly IDR 50.000 for doing so). Though I obviously lost all of my own data and all of those progresses that I saved on it's own internal storage, but I was able to restore whatever else that I used to do those stuffs that I usually do on it, but not all of them though (unless everything on it is all set already as of today). Well, that simply concluded about how the problem itself that was initially occurred from (supposed to be) that one random app, until all the way to how I was able to fix it by resetting the entire 📱's operating system itself back to it's factory settings.
As of today, it now works fairly 🆗 as if it was brand 🆕 from 6 years ago. Unfortunately though, according to the repairman who repaired this in his own service center, the entire old Android 9 operating system itself that is installed specifically on this 📱 will definitely obsolete roughly in the next year (or two). Because of this particular statement that he specifically said so to me, I don't think if I will decide to get a brand 🆕 Android 📱 with newer Android operating system(s) once this 📱 no longer support it's own old Android operating system soon (unless if he would able to install custom Android operating system on it [such as something like Lineage OS, CMIIW], but I highly doubt it)............ Only the time will tell about the actual truth particularly about this once it will happens soon.