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What you could do is a full system android backup* followed by a factory reset and the updates. Than test whether the problems are resolved. If not restore the backup. Otherwise install your apps piecemeal to see which is causing the problems.
As autofocus is mostly software, you at least know that it worked with that system before, so if the problem persists, you might have to look into physical problems. E.g. scratched lens, condense on lens preventing autofocus.
Of course, you could just say that it is Chinese crap: It justifies you to bin the phone and buy a new one. Consumer power! That is also an approach. To me my Hisense A5 pro cc doesn't seem like crap, not Chinese nor otherwise. However, I've only had it a month, so I don't have any experience with its durability.
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* Google it. It's a standard approach.
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