Welcome!
My name is Stephan and I am from Austria. I am a bit of an obsessive-compulsive disorder type kind of guy (=OCD). If something does not work as it should, especially with Android phones or certain other things, I get mentally very unstable, but 100 % focused on trying to solve the thing, or at least, look behind the curtain and find a solution, which fits my mind. Some problems, which are mentioned here and in the future, are NO problems at all for many other people, they just don't care. For them, it makes no difference, if the android phone drains the battery or not.
Take Google Play services on Android for example: if you want to fix it, you have exactly two options: wreck your phone totally with hours of work in the aftermath, or: fix it the right way, with exactly knowing what you are doing in any move of yours without having the fear, that the phone wrecks your weekend. I did it all and boy, would I be glad if I knew some stuff BEFORE I did press that button.
Therefore, already knowing that not many people will read my stuff, I do summarize some of my worst projects, which got solved in a certain way, and hopefully, help others, who fight the same problems like me.
You may say, we are living in the age of AI, but funnily, no, AI did help me for sure to gather more knowledge, but it did not make any real difference to the real-world tests, I did with my stuff. Those try-outs are really time consuming, but in the end, it helped and AI just said: told you so, what is a blatantly lie, but it is like it is: people do lie, AI, too.
Those problems are rather specific ones, but to be honest: these things can take hours or days at least to be understood. If you search on the net, for example, "android drains my battery", you will find a zillion links, but in the end, it is just the same stuff, explaining nothing.
So, hopefully, you find some useful content and I can save you time on specific topics, which get added over time.